Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35f572456b5a530…

MALICIOUS

PDF

21.0 KB Created: 2019-04-30 03:30:27 +01:00 Authoring application: mPDF 5.7
MD5: b87e41b60f9983a414c5a58f0dba57bb SHA-1: 953fad5a6ee3f15c640623cc57312be591af72d4 SHA-256: d35f572456b5a5309c8f4fc1129656f22a6f6d73906921dc74a655fb51fc0242
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with 26 links pointing to PDFs hosted on the domain 'muicuiu.dumb1.com'. This heuristic strongly suggests a malicious intent, likely for SEO manipulation or to distribute further malware. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous links to external PDFs on a suspicious domain is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://muicuiu.dumb1.com/2a03a07a08a00/Marvel-Comics-The-Untold-Story-by-Sean-Howe.pdf
    • http://muicuiu.dumb1.com/6a02a03a00a05a00/Give-Our-Regards-to-the-Atomsmashers-Writers-on-Comics-by-Sean-Howe.pdf
    • http://muicuiu.dumb1.com/1a01a04a06a06a02a06/Film-Memes-Book-2-Marvel-Comics-Vs-DC-Universe-Funny-Jokes-Cartoons-and-Pictu-Film-Memes-Marvel-Comics-Vs-DC-Universe-by-Film-Memes.pdf
    • http://muicuiu.dumb1.com/1a01a06a06a09a00a02/The-Amazing-Spider-Man-377-by-Marvel-Comics.pdf
    • http://muicuiu.dumb1.com/1a06a01a08a03a00/Origins-of-Marvel-Comics-by-Stan-Lee.pdf
    • http://muicuiu.dumb1.com/4a01a03a06a04/Civil-War-A-Marvel-Comics-Event-by-Mark-Millar.pdf
    • http://muicuiu.dumb1.com/3a04a01a01a00a06/Declan-Reede-The-Untold-Story-Complete-Series-Declan-Reede-The-Untold-Story-1-5-by-Michelle-Irwin.pdf
    • http://muicuiu.dumb1.com/2a09a05a08a02a03/Labor-s-Untold-Story-The-Adventure-Story-of-the-Battles-Betrayals-and-Victories-of-American-Working-Men-and-Women-by-Richard-O-Boyer.pdf
    • http://muicuiu.dumb1.com/1a00a09a04a00a00a08/Focus-On-100-Most-Popular-Fictional-Adoptees-Jessica-Jones-Iron-Man-Princess-Leia-Quicksilver-comics-Havok-comics-Jon-Snow-character-Uhtred-Krueger-Rogue-comics-Hellboy-etc-by-Wikipedia-contributors.pdf
    • http://muicuiu.dumb1.com/3a01a06a04a03a09/Otter-and-Odder-A-Love-Story-by-James-Howe.pdf
    • http://muicuiu.dumb1.com/3a00a01a08a09/Snailsworth-a-Slow-Little-Story-by-Tina-Field-Howe.pdf
    • http://muicuiu.dumb1.com/4a02a08a01a03a09/Mata-Hari-The-True-Story-by-Russell-Warren-Howe.pdf
    • http://muicuiu.dumb1.com/1a09a03a04a06a06/Heroes-of-Power-The-Women-of-Marvel-All-New-Marvel-Treasury-Edition-by-Christopher-Hastings.pdf
    • http://muicuiu.dumb1.com/6a01a08a07a01a07/The-Untold-Story-by-Rufin-Ondoua.pdf
    • http://muicuiu.dumb1.com/3a06a07a03a08a09/The-Third-World-War-The-Untold-Story-by-John-W-Hackett.pdf
    • http://muicuiu.dumb1.com/1a00a09a09a03a01a08/Big-Brown-The-Untold-Story-of-Ups-by-Greg-Niemann.pdf
    • http://muicuiu.dumb1.com/4a03a06a00a09a02/One-and-Only-The-Untold-Story-of-On-the-Road-by-Gerald-Nicosia.pdf
    • http://muicuiu.dumb1.com/8a00a08a01a00a00/Disney-Frozen-The-Story-of-the-Movie-in-Comics-by-Voila.pdf
    • http://muicuiu.dumb1.com/1a00a03a03a02a07a04/Beyond-the-Masque-The-Untold-Story-of-Erik-and-Christine-by-Kae-D-Jacobs.pdf
    • http://muicuiu.dumb1.com/4a04a06a05a00a09/Shrinks-The-Untold-Story-of-Psychiatry-by-Jeffrey-A-Lieberman.pdf