Key Findings Operation FlutterBridge is a sophisticated malvertising campaign targeting macOS users since late 2025, evolving from basic adware into a dangerous backdoor called FlutterShell Threat actors use fake shell companies to purchase verified Google and YouTube ads, bypassing security filters through artificial aging and legitimate developer credentials The malware masquerades as productivity tools including Podcasts Lounge, PDF-Brain, and PDF-Ninja, with three distinc
