Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c80fba31ed87bee…

MALICIOUS

PDF

16.3 KB Created: 2019-04-30 03:29:56 +01:00 Authoring application: mPDF 5.7
MD5: 164cbb5c85fd3fd13db09c50745e1e6f SHA-1: 0142ab3d5bde99057272d216bfbd900ef7c30d25 SHA-256: 8c80fba31ed87beee1ddbe7185eb395bd73c04c977057ab06d80d8849637648c
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified as a link farm. While the URLs themselves are currently marked as benign, the sheer volume and the heuristic firing of PDF_SEO_LINK_FARM suggest a malicious intent, possibly for SEO poisoning or to distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine the exact payload or delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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/4a02a05a05a07a03/The-Last-Ditch-by-Sandy-Mitchell.pdf
    • http://muicuiu.dumb1.com/1a06a04a02a06a09/Ciaphas-Cain-Defender-of-the-Imperium-by-Sandy-Mitchell.pdf
    • http://muicuiu.dumb1.com/7a09a09a08a02a01/I-Know-Where-She-Is-by-S-B-Caves.pdf
    • http://muicuiu.dumb1.com/9a05a07a05a03a07/In-the-Caves-of-Exile-by-Ru-Emerson.pdf
    • http://muicuiu.dumb1.com/4a05a04a09a01a04/The-Lotus-Caves-by-John-Christopher.pdf
    • http://muicuiu.dumb1.com/7a06a01a04a04a07/Visiting-the-Caves-by-William-Plomer.pdf
    • http://muicuiu.dumb1.com/7a09a09a08a01a07/Maroo-of-the-Winter-Caves-by-Ann-Turnbull.pdf
    • http://muicuiu.dumb1.com/1a03a01a02a02a01/The-Caves-That-Time-Forgot-Seven-Sleepers-4-by-Gilbert-L-Morris.pdf
    • http://muicuiu.dumb1.com/1a00a08a02a06a01/The-Caves-of-Tavannar-The-Crystal-Keeper-Trilogy-1-by-W-J-Lennox.pdf
    • http://muicuiu.dumb1.com/5a01a07a08a09a02/Caves-Exploring-New-Zealand-s-Subterranean-Wilderness-by-Marcus-Thomas.pdf
    • http://muicuiu.dumb1.com/1a01a06a03a03a05a09/Caves-of-Ice-Diaries-1946-1947-by-James-Lees-Milne.pdf
    • http://muicuiu.dumb1.com/2a03a09a01a04a03/The-Strong-Eye-of-Shamanism-A-Journey-into-the-Caves-of-Consciousness-by-Robert-E-Ryan.pdf
    • http://muicuiu.dumb1.com/1a01a08a07a08a00a04/Cave-Art-A-Guide-to-the-Decorated-Ice-Age-Caves-of-Europe-by-Paul-G-Bahn.pdf
    • http://muicuiu.dumb1.com/3a06a03a04a05a07/Lost-Cantos-of-the-Ouroboros-Caves-Expanded-Edition-by-Maggie-Schein.pdf
    • http://muicuiu.dumb1.com/1a05a06a05a00a06/The-Andaluins-and-the-Chamber-of-Thousands-Caves-The-Andaluins-Saga-1-by-Gabriel-Aznarez.pdf
    • http://muicuiu.dumb1.com/6a06a04a03a01/A-Little-Something-Different-by-Sandy-Hall.pdf
    • http://muicuiu.dumb1.com/1a01a04a07a01a02a00/War-Against-the-Taliban-by-Sandy-Gall.pdf
    • http://muicuiu.dumb1.com/2a06a01a07a06a07/Maggie-Mae-by-Sandy-Wolters.pdf
    • http://muicuiu.dumb1.com/5a01a08a07a09a04/The-Seeker-by-Sandy-James.pdf
    • http://muicuiu.dumb1.com/1a04a09a01a03a00/Too-Many-Frogs-by-Sandy-Asher.pdf
    • http://muicuiu.dumb1.com/1a01a06a03a03a05a09/Caves-of-Ice-Diaries-194

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