Brazilian Ad Fraud Network 'Camu' Hits 2B+ Daily Bid Requests

The report describes "Camu," a Brazil-based ad-fraud operation that ran piracy sites which redirected users to ad-filled cashout domains using cookie-issued admission tokens and referrer spoofing. At its peak Camu processed ~2.5 billion bid requests per day by masking referral data and serving benign decoy pages to investigators or advertisers, exploiting the programmatic ad-exchange ecosystem to monetize fraudulent impressions.