Many "adders" are actually password-stealing Trojans. Once you run the executable inside the ".rar", it prompts you to log into a fake PayPal login screen. Your username and password are sent directly to scammers.
Despite being fake, these scams persist because: Paypal Money Adder Working Last Version Rar
If you're looking for software or tools to manage your PayPal transactions more efficiently, ensure you: Many "adders" are actually password-stealing Trojans