Hi mates,
few months ago some friends asked me some additional info regarding specific attacks that were done to redirect user traffic to a desired/different web site.
The attack is called DNS Poisoning and it's done, simply speaking, polluting the DNS cache of specific servers.
More popular is the web site attacked, more amplified will be the impact.
In that way when a user will try to resolve the name of the website that he/she is asking for, the DNS will give him/she a different IP instead of the right one.(consider that the same approach could be used for mail system for example)