Security researcher Axelle Apvrille recently published a paper about AdThief, a malware aimed at hijacking ad revenue from a reportedly 75,000 infected devices. First discovered in March 2014, and also known as "spad," the malware, which comes disguised as a Cydia Substrate extension, was found to replace the publisher ID of publishers with the one of the malware creator, effectively attributing all ad revenue to him.
AdThief malware found infecting 75,000 jailbroken devices