Marketer’s Guide to Ad Fraud – What it is and How to Solve it
If your campaigns are costing you more than they’re performing, it’s time to rebuild your strategy, because the issue might be lying in your traffic itself. Ad fraud has become one of the biggest reasons impacting your campaigns and marketing budgets across walled gardens, open networks, affiliate platforms, apps, and programmatic ecosystems. The first half of 2025 recorded an average global ad fraud rate of 39.7%, and fraud peaked at 49% in June, the highest in five years. With AI-driven bots, fake users, and manipulated attribution becoming more advanced, the financial impact is far deeper than most marketers realize. Therefore, to help you get clarity, this guide will help you understand what ad fraud looks like today, where it hides, how it impacts real performance, and what you can do to protect your budgets with the right validation strategies. What is Ad Fraud? Ad fraud is the deliberate manipulation of advertising systems to generate illegitimate revenue by simulating real user interactions, such as clicks, installs, or views, without actual consumer interest. The lost advertising money is not the only obvious impact of fraudulent activities. Since fraudsters manipulate the most important ad performance metrics, they also skew the insights marketers and advertising teams may draw from those metrics. The impact from this, in many cases, leads to a long-term negative impact on the brand’s advertising efforts. The problem is made worse because of the availability of options for fraudsters. Let’s look at some of the most common methods and techniques employed by fraudsters to scam honest advertisers. What are the Different Types of Ad Fraud? [Channel-wise Fraud] Types of Web Ad Fraud Web advertising remains one of the most vulnerable digital channels because of the open networks and automated programmatic advertising ecosystem, that makes it challenging to track and verify the legitimacy of each impression and click. Here are the common types of web ad fraud techniques every advertiser must be aware of: Click Fraud As the name suggests, click fraud involves generating fake clicks on pay-per-click (PPC) campaigns. Many fraudsters use simple bots to generate these fake clicks. However, most ad networks and platforms can now detect fake clicks coming from simple bots. To overcome this, fraudsters have started developing and deploying sophisticated bots that can mimic human-user behavior and fool the algorithms of the ad platforms. In some cases, specifically in less developed countries, fraudsters employ cheap labor on “click farms” to generate fake clicks without attracting suspicion from ad networks. Impression Fraud Impression fraud involves fraudsters creating fake impressions on ads that pay in exchange for those impressions. This type of fraud also often involves bots to create fake traffic that can be used to register impressions on ads. Tech-savvy fraudsters may also use more sophisticated methods such as pixel stuffing or ad stacking. With pixel stuffing, the fraudsters “stuff” the ad into a single pixel on their webpage. This way, when a real user visit said webpage, they don’t see the ad and the fraud publisher still ends up getting paid for that impression. Similarly, ad stacking involves “stacking” multiple ads on top of each other in a single ad space on the webpage. This way, when the user visits the page, they may see just one ad, but the fraud publisher will get paid for all the ads stacked in the ad space. Domain Spoofing Domain spoofing is a type of ad fraud where a fraudster tricks advertisers into thinking their ads are showing on popular, trustworthy websites. However, in reality, the ads run on low-quality MFA (Made for Advertisements) websites or even fake websites. The primary goal is usually to steal sensitive information like login credentials, generate fake leads, and earn money. In digital terms, the fraudsters change the website’s identity by using a spoofed domain name, elements, and visuals (similar to that of a legitimate website like a well-known press release page) during the ad auction process, so it appears to be a premium site. Advertisers end up paying high prices, thinking their ad is being seen by a valuable audience, but it’s actually wasted on irrelevant or fake traffic, hurting performance, ad budgets, and brand safety. Cookie Stuffing Cookie stuffing is one of the common ad fraud tactics used by fraudsters to manipulate affiliate marketing performance. This happens when a fraudulent affiliate secretly “stuffs” or adds multiple affiliate tracking cookies into a user’s browser without their knowledge or action. These cookies are meant to track if the user later makes a purchase on a brand’s site. If they do, the fraudster earns a commission, even though they didn’t contribute to the sale. It’s like someone secretly putting their referral name on your order so they can get credit. This affiliate fraud tactic hurts brands because it inflates affiliate payouts, messes up marketing data, and steals credit from genuine affiliates who actually put real efforts to earn the sale. Geo Masking Geo masking, also known as location fraud, is another type of web ad fraud where the actual location of the user is hidden or faked to make it appear as if they are from a targeted region. Fraudsters use various methods like using proxy servers, or VPNs to route invalid traffic through target locations spoofing GPS data and IP addresses. Fraudsters do this to trick advertisers into paying higher rates for traffic that looks like it’s genuine, when it’s really coming from irrelevant regions, misleading performance metrics and further campaign optimization. Types of Mobile Ad Fraud With the expansive growth in app-based marketing and the complexity of attribution models, mobile apps have become a breeding ground for highly sophisticated ad fraud. These fraud types manipulate app installs, in-app engagements, and user attribution at each stage of the funnel using following techniques: Install Fraud Install fraud is a type of mobile ad fraud and involves faking app installs to scam advertisers that operate on cost-per-install (CPI) campaigns. Fraudsters may employ simple or sophisticated techniques to execute this type of fraud. Simpler techniques
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