spectrogram:
it's pure noise. It could be a file of some sort (like a jpeg) interpreted as a wav file, but the thing is if it is that we have no way whatsoever of recovering any data from it since it's stored in a format which makes it loose a lot of the original information. So in other words, there's nothing we can get out of it.
I also tried to do some manipulation on that gif with the purple and green dots from before. That dot pattern isn't actual data, it's dithering artifacts (
https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering ) from what was probably a very dark gradient that was applied to the image.
I applied some blurring and contrast-upping to recover some data from what the image may have looked like originally:
It looks like there's some binary text that was supposed to be in that little rectangle near the top left, however whoever encoded it *ahem* screwed it up so badly that it's completely unrecoverable.
