You mistyped the URL:
I confirmed that the redirect to router.php happens when you mistype the URL, and does not happen when you type it correctly.
Note that typosquatting (which is what this is called) is a serious security problem as you no doubt can see. Had the attacker simply showed a Google login, you would have given him your username, password, and possibly 2-factor token.
This is why you NEVER should manually type in a URL to anything remotely important. Use bookmarks or other similar references. And also use a password minder like lastpass, which will not be as easily fooled -- your password won't auto-fill on the wrong site, so you know that if the password doesn't automatically show up, then you're looking at the wrong URL.