Sure, Jan.
View attachment 3295905
Firstly, Pixeldrain is the one showing 30 MB larger, not Mixdrop. So if there was a virus or malware injected, it would be on the larger of the two, not the smaller.
View attachment 3295919
View attachment 3295915
Secondly, 520,000,000 bytes (520 MB on Pixeldrain, as defined as a decimal MB) divided by 1,048,576 (which is a binary MB) equals 495.91 MB, which is nearly identical to the 495.63 MB reported by Mixdrop, which the rounding of Pixeldrain to a whole MB would account for (519.71 MB decimal is 495.63 MB binary). Yes, it does account for the difference.
Thirdly, highly doubtful.
View attachment 3295928
Finally, I repeat my first assertion - the problem isn't the file. Which has been shown in my posting of VirusTotal links. Which has been proven in our banter. Which has been proven in these screenshots. That leaves only one source of the problem.
PS: Again, if you want to compare dick sizes - it's best to do so in private chat to stave off embarrassment.