Sorry, I am new here, but I had an idea. Maybe the message isn't sent by Krakens or Kerbals, but by someone else entirely. Here's how I get my conclusion:
There's an alien species trying to visit Kerbin, then the Kraken attacked their rocket and it got damaged/destroyed. So now these aliens are stranded near the Kerbol system and are asking the Kerbals for help.
So the message shows a map of Kerbol with Kerbin highlighted, which I suspect is them saying what their intentions were, to come visit here (whether we should trust them is a whole 'nother deal), then it shows their spacecraft getting destroyed by the Kraken, with an arrow pointing into the array of dots (let's keep the theme that this may be indicating some sort of distance or travel time maybe?) and then another arrow points into the mysterious thing with 4 other things around it. I suspect that this is the hypothesised 8th planet and that it has 4 moons around it, and what they're telling us is that they're stranded there. Alternatively, it might indicate what their system of origin is.