http://blog.pentestbegins.com/2017/07/21/hacking-into-paypal-server-remote-code-execution-2017/
https://www.paypal.com/bugbounty/
https://www.virustotal.com/en/domain/paypalcorp.com/information/
https://github.com/TheRook/subbrute
https://github.com/guelfoweb/knock
https://github.com/jhaddix/domain
origin - http://www.pipiscrew.com/?p=9261 how-i-hacked-into-a-paypal-server