Chrome began to swear at our site "Malware Ahead!"

Question

Google Chrome

Good day everyone!

Just the other day, on one of the internal pages, chrome began to swear about malicious content:
dl.dropboxusercontent.com/u/3881725/06.20.2013-17.21.png

Tell me in general which way to dig?
Site on Django + Websockets + Backbone, there are all sorts of third-party scripts, distributes Nginx.

Answer 1

Deleted my comment... I was wrong.

Answer 2

Your screenshot shows the reason. Malicious code from dreamalittledream.ca .
If you installed this code, just remove it.

Answer 3

Scan through sucuri.net/ if there is something to swear at, it will show this particular place. An injection from an iframe or similar may already be in the database, then it is useless to disable scripts.