Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a17af7307971a0…

MALICIOUS

PDF

14.5 KB Created: 2019-05-07 04:49:47 +01:00 Authoring application: mPDF 5.7
MD5: 8693a12b7fba26a2552e8ed7609f19c7 SHA-1: 588d35751771d6bb2bf321c645f912f4b40bb35d SHA-256: c5a17af7307971a0c35a88b337d0639614c578548a321ef2587f793adf67e7ed
90 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic. While the URLs themselves are marked as benign, the sheer volume and structure suggest a malicious intent, possibly for SEO manipulation or to serve as a lure for further malicious activity. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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/1a00a01a03a03/The-Rhesus-Chart-Laundry-Files-5-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/6a01a03a02/The-Delirium-Brief-Laundry-Files-8-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/7a01a08a08a06a03/Down-on-the-Farm-Laundry-Files-2-5-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a06a07a02a03/The-Jennifer-Morgue-Laundry-Files-2-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/3a05a04a00a05a01/The-Labyrinth-Index-Laundry-Files-9-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/4a07a04a01a01a02/The-Jennifer-Morgue-Laundry-Files-2-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/1a00a07a00a09/The-Fuller-Memorandum-Laundry-Files-3-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/1a01a06a01a07a09a09/Chart-No-1-Nautical-Chart-Symbols-Abbreviations-and-Terms-by-Nima-and-Noaa.pdf
    • http://muicuiu.dumb1.com/7a01a08a08a06a06/Missile-Gap-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a04a08a04a06/Accelerando-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/3a00a07a07a08a09/A-Colder-War-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a02a05a07a04a03/Bit-Rot-Freyaverse-1-5-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a00a08a05a08a04/Rule-34-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/3a01a09a05a02/The-Annihilation-Score-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/8a00a02a08a06a04/Festival-Of-Fools-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a04a08a06a04/Singularity-Sky-Eschaton-1-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a04a08a02a01/Saturn-s-Children-Freyaverse-1-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/5a05a09a09a05/Rule-34-Halting-State-2-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/2a09a00a04a07a01/The-Merchants-War-The-Merchant-Princes-4-by-Charles-Stross.pdf
    • http://muicuiu.dumb1.com/4a00a03a04a01a07/The-Bloodline-Feud-The-Merchant-Princes-1-2-by-Charles-Stross.pdf

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