You're going to share the jackpot with dozens of other winners, so it wouldn't be immediately obvious which of the winners rigged it. While if you pick a random number sequence and are the only winner, you'll be the prime suspect if anyone realises the draw was rigged.
-I'd say that is plausible if next week's draw turns out to be 1-2-3-4-5-6, for instance.
(That is - as is pointed out upthread, such 'weird' draws will occur naturally on occasion. It would, however, be quite suspicious if it happened twice in a row.)
I am sure one of the things the lottery looks into is how many coupons with 'weird' numbers chosen like this week's winning numbers have been picked in the past - of course, if you get a result which makes you suspect shenanigans AND the number of coupons with such a strange sequence of numbers is way up from normal, then perhaps that suspicion is well founded.