You want users who scan the QR code to be redirected to a URL chosen at random from some.
With a static QR code you have to implement an HTTP redirect system on your web server. If you are a programmer, that’s not a problem. If not, here it is a simple solution.
Solution
The strategy involves creating multiple QR codes with the exact same key and different redirect URLs.
So you will have to repeat the same procedure as many times as the different URLs you want to have.