DDos via Google Plus Servers
The vulnerable pages are “/_/sharebox/linkpreview/“ and “gadgets/proxy?“
Is possible to request any file type, and G+ will download and show all the content. So, if you parallelize so many requests, is possible to DDoS any site with Google bandwidth. Is also possible to start the attack without be logged in G+. If anything, Google will notice [attack attempts] and probably blacklist you.

Source
http://pastebin.com/2uRGm9jY

by
R00T.ATI