Malicious PDF — malware analysis report

Static analysis result for SHA-256 c336ccfb3ba382e7…

MALICIOUS

PDF

14.7 KB Created: 2019-05-02 01:33:56 +01:00 Authoring application: mPDF 5.7
MD5: 2319d767ba3dc6297d8fb874374afcb6 SHA-1: 9552acc37b69f26c10010b849e325ea284a7677e SHA-256: c336ccfb3ba382e708e405598e21d7b251009189de674631092ca6f04faafc9b
90 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with 21 links pointing to various book titles on a subdomain. While most individual URLs are marked as benign, the sheer volume and structure of these links, combined with the ML classifier's high confidence score, suggest a malicious intent. The attack pattern is likely to be SEO manipulation or a lure to host malicious content, disguised as legitimate document links. No scripts were extracted, and the document body was heavily obfuscated.

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/2a05a04a01a00a05/The-Turing-Exception-Singularity-4-by-William-Hertling.pdf
    • http://muicuiu.dumb1.com/1a03a06a00a01a01/A-I-Apocalypse-Singularity-2-by-William-Hertling.pdf
    • http://muicuiu.dumb1.com/1a04a00a00a03/Singularity-by-William-Sleator.pdf
    • http://muicuiu.dumb1.com/6a07a09a02a06a09/The-Roman-Catacombs-and-Their-Martyrs-by-Ludwig-Hertling.pdf
    • http://muicuiu.dumb1.com/4a02a04a06a08a07/Alan-Turing-by-Andrew-Hodges.pdf
    • http://muicuiu.dumb1.com/4a07a05a08a03a02/Alan-Turing-The-Enigma-by-Andrew-Hodges.pdf
    • http://muicuiu.dumb1.com/7a05a08a05a04a08/Alan-Turing-Unlocking-the-Enigma-by-David-Boyle.pdf
    • http://muicuiu.dumb1.com/3a05a07a08a03a05/Access-Denied-Turing-Hopper-3-by-Donna-Andrews.pdf
    • http://muicuiu.dumb1.com/1a01a07a08a03a08a05/The-New-Turing-Omnibus-66-Excursions-In-Computer-Science-by-A-K-Dewdney.pdf
    • http://muicuiu.dumb1.com/6a09a05a01a01/Turing-s-Cathedral-The-Origins-of-the-Digital-Universe-by-George-Dyson.pdf
    • http://muicuiu.dumb1.com/1a03a00a05a09a06/The-Exception-by-Christian-Jungersen.pdf
    • http://muicuiu.dumb1.com/6a05a04a06a08a02/The-Connection-The-Exception-1-5-by-Adriana-Locke.pdf
    • http://muicuiu.dumb1.com/1a07a02a03a05a00/The-Exception-to-the-Rule-by-Beth-Rinyu.pdf
    • http://muicuiu.dumb1.com/1a01a00a09a07a06a02/No-Details-The-Only-Exception-1-by-Marie-Wathen.pdf
    • http://muicuiu.dumb1.com/7a01a09a07a00a06/The-Universal-Exception-by-Slavoj-i-ek.pdf
    • http://muicuiu.dumb1.com/6a05a04a06a05a06/The-Perception-The-Exception-2-by-Adriana-Locke.pdf
    • http://muicuiu.dumb1.com/3a09a01a08a06a03/Singularity-Hide-2-by-Jax-Spenser.pdf
    • http://muicuiu.dumb1.com/1a06a04a08a04a05/A-Naked-Singularity-by-Sergio-de-la-Pava.pdf
    • http://muicuiu.dumb1.com/1a05a05a03a08a03/Of-Song-and-Singularity-by-Emory-Skwara.pdf
    • http://muicuiu.dumb1.com/4a03a00a04a00a05/The-Singularity-Trap-by-Dennis-E-Taylor.pdf

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