Presumably it's so it can be used as a subdependency for setting up an attack in a popular, legitimate package, e.g. via a pull request. The code in the legitimate package would not arouse suspicion at all.
Now I'm curious what the target was. Are there any notable classes of programs/problems where you'd do an LU decomposition of this specific matrix?
Now I'm curious what the target was. Are there any notable classes of programs/problems where you'd do an LU decomposition of this specific matrix?