Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d301c73daae7f…

MALICIOUS

PDF

12.4 KB Created: 2019-04-30 01:59:45 +01:00 Authoring application: mPDF 5.7
MD5: 8bc4a5151c6c8c82616e5b32d0bf239f SHA-1: d5163ae4edc247c023ff81196acf610b55381803 SHA-256: ef9d301c73daae7f82d51f5910cbeb66db25bce6f1d82028ece6ca9607d1e909
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8780

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/1a08a03a04a07a08/Neil-Gaiman-and-Charles-Vess-Stardust-1-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/1a08a03a04a06a04/The-Neil-Gaiman-Audio-Collection-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/5a05a01a06a08a04/Neil-Gaiman-Collection-5-Books-Collection-Set-With-Gift-Journal-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/7a02a07a01a04a08/DC-Universe-By-Neil-Gaiman-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a02a09a04a07a08/Stardust-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/1a02a00a09a05a08/Coraline-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/1a08a03a04a09a01/Chu-s-First-Day-of-School-Chu-2-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a07a07a05a06a03/Coraline-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/1a01a04a01a09a00a09/Melinda-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/4a01a05a02a01a04/Stardust-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/1a00a05a09a07/Instructions-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/4a01a03a05a06a06/Stardust-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a08a09a01a07a06/Only-the-End-of-the-World-Again-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a07a04a09a05a04/M-Is-for-Magic-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a04a09a01a01a05/Down-Among-the-Dead-Men-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/3a00a06a04a04a05/Neverwhere-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/9a05a05a07a01a03/Two-Plays-for-Voices-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/8a04a09a09a09/Unnatural-Creatures-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a07a07a04a00a09/The-Graveyard-Book-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/4a04a04a01a04a04/A-Game-of-You-The-Sandman-5-by-Neil-Gaiman.pdf
    • http://muicuiu.dumb1.com/2a07a04a09a05a04/M-Is-

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