It's been like this for a while, at least a year, but had previously been set up so that it would redirect randomly (or targeted), but if you revisited the URL it would show you the correct page. I kept forgetting to report it after getting lost in whatever I went there to read in the first place, but I knew it wasn't anything wrong with my browser.
Now the malware is just going balls out and redirecting everyone.
You'd be better off taking the website offline while you fix it in my opinion, or at least making it inaccessible without a password or whatever. Google will start penalising your rankings if it hasn't already.