Malicious PDF — malware analysis report

Static analysis result for SHA-256 631ef6c0012d4aff…

MALICIOUS

PDF

22.7 KB Created: 2020-03-18 22:26:49 +00:00 Authoring application: mPDF 5.7
MD5: 3f42fc5fa542aa6251b4466070594237 SHA-1: f8799633108aeb29c2cf3a3a0c607248611af3d2 SHA-256: 631ef6c0012d4aff6a4822ceb641f8acfe93ba4de05ed9f3d95ed7102247ac4e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified as a link farm, which is a common tactic for distributing malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for further payload delivery or phishing. The document body, though heavily obfuscated, contains these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 3

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ujcsiniio.myhome.cx/8cd8cd3cd8cd3cd6/Stargate-SG-1-The-Ultimate-Visual-Guide-by-Kathleen-Ritter.pdf
    • http://ujcsiniio.myhome.cx/1cd1cd2cd6cd4cd1cd7/World-of-Warcraft-Ultimate-Visual-Guide-by-Alastair-Dougall.pdf
    • http://ujcsiniio.myhome.cx/3cd5cd9cd8cd8cd6/The-New-Western-Garden-Book-The-Ultimate-Gardening-Guide-by-Kathleen-Norris-Brenzel.pdf
    • http://ujcsiniio.myhome.cx/4cd0cd5cd0cd5cd2/Visual-Inspirations-A-Visual-Guide-of-Inspiring-Words-And-Quotes-by-Avis-J-Williams.pdf
    • http://ujcsiniio.myhome.cx/1cd0cd9cd8cd2cd5cd7/30-Days-to-Diamond-The-Ultimate-League-of-Legends-Guide-to-Climbing-Ranked-The-Ultimate-League-of-Legends-Guide-to-Climbing-the-Ranked-Ladder-Book-1-by-St-Petr.pdf
    • http://ujcsiniio.myhome.cx/5cd7cd9cd1cd7cd3/Ultimate-Handbook-Guide-to-Bucharest-Romania-Travel-Guide-by-Hye-Ducharme.pdf
    • http://ujcsiniio.myhome.cx/9cd7cd0cd1cd0/Cryptocurrency-For-Dummies-The-Ultimate-Guide-to-Investing-and-Trading-in-Cryptocurrency-for-Beginners-The-Easiest-Guide-to-Understand-Blockchain-Bitcoin-ICO-and-others-by-Jones-Richblood.pdf
    • http://ujcsiniio.myhome.cx/1cd1cd6cd7cd0cd2cd3/Visual-Guide-To-Lock-Picking-by-Mark-McCloud.pdf
    • http://ujcsiniio.myhome.cx/9cd3cd2cd1cd0cd6/FileMaker-Pro-2-1-for-the-Macintosh-Visual-QuickStart-Guide-by-Adam-Greif.pdf
    • http://ujcsiniio.myhome.cx/1cd1cd2cd1cd6cd9cd2/Catwoman-The-Visual-Guide-to-the-Feline-Fatale-by-Scott-Beatty.pdf
    • http://ujcsiniio.myhome.cx/7cd7cd3cd3cd0cd1/History-The-Definitive-Visual-Guide-by-Adam-Hart-Davis.pdf
    • http://ujcsiniio.myhome.cx/2cd4cd2cd3cd2cd6/The-Visual-Miscellaneum-A-Colorful-Guide-to-the-World-s-Most-Consequential-Trivia-by-David-McCandless.pdf
    • http://ujcsiniio.myhome.cx/1cd1cd0cd9cd8cd9cd0/Deep-Tissue-Massage-Revised-Edition-A-Visual-Guide-to-Techniques-by-Art-Riggs.pdf
    • http://ujcsiniio.myhome.cx/4cd1cd2cd3cd3cd6/The-Sketchnote-Handbook-The-Illustrated-Guide-to-Visual-Note-Taking-by-Mike-Rohde.pdf
    • http://ujcsiniio.myhome.cx/5cd6cd8cd4cd5cd9/Java-1-1-Developer-s-Guide-With-Includes-Microsoft-Visual-J-1-1-Trial-Edition-by-Jamie-Jaworski.pdf
    • http://ujcsiniio.myhome.cx/8cd2cd7cd2cd9cd1/The-Ultimate-Guide-to-Permaculture-by-Faires.pdf
    • http://ujcsiniio.myhome.cx/1cd1cd4cd8cd8cd3cd2/How-To-Drive-The-Ultimate-Guide-from-the-Man-Who-Was-the-Stig-by-Ben-Collins.pdf
    • http://ujcsiniio.myhome.cx/5cd0cd2cd3cd3/The-Ultimate-Ps3-tm-Repair-Guide-by-Andrew-Wright.pdf
    • http://ujcsiniio.myhome.cx/8cd0cd7cd0cd9cd7/The-ultimate-guide-to-texting-girls-by-Artisan.pdf
    • http://ujcsiniio.myhome.cx/1cd0cd0cd2cd0cd0cd5/Visual-Finance-The-One-Page-Visual-Model-to-Understand-Financial-Statements-and-Make-Better-Business-Decisions-by-Georgi-Tsvetanov.pdf

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