Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51224d4d48a6d1b…

MALICIOUS

PDF

25.3 KB Created: 2019-04-29 23:00:15 +01:00 Authoring application: mPDF 5.7
MD5: 984411eba9913356f5215690dbeaf059 SHA-1: 0426c2427da692419772777d965bbcdff55d3ab5 SHA-256: f51224d4d48a6d1b49a934b7ac80c30ee4ae05a9ca9ccef0798d6aec2fad0c79
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, many of which are hosted on the dynamic DNS domain 'zacdsa.linkpc.net'. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://zacdsa.linkpc.net/2c52c51c52c56c57/A-Guide-to-Using-Pink-Place-amp-Blue-Blaze-Teacher-s-Guide-with-Copyright-Free-Illustrations-by-Deb-Simpson.pdf
    • http://zacdsa.linkpc.net/9c55c51c56c55/The-G-Free-Diet-A-Gluten-Free-Survival-Guide-by-Elisabeth-Hasselbeck.pdf
    • http://zacdsa.linkpc.net/2c50c59c51c56c56/Bart-Simpson-s-Guide-to-Life-A-Wee-Handbook-for-the-Perplexed-by-Matt-Groening.pdf
    • http://zacdsa.linkpc.net/6c51c59c52c54/English-Women-s-Clothing-in-the-Nineteenth-Century-A-Comprehensive-Guide-with-1-117-Illustrations-by-C-Willett-Cunnington.pdf
    • http://zacdsa.linkpc.net/1c50c50c58c58c54c54/The-Adventures-of-Johnny-Bunko-The-Last-Career-Guide-You-ll-Ever-Need-by-Daniel-H-Pink.pdf
    • http://zacdsa.linkpc.net/2c54c56c52c57c57/The-Teacher-s-Guide-To-Spying-by-Daniel-Abbott.pdf
    • http://zacdsa.linkpc.net/9c53c59c51c52c50/A-Teacher-s-Guide-to-Education-Law-by-Michael-Mickey-Imber.pdf
    • http://zacdsa.linkpc.net/3c51c57c51c53c53/Where-the-Red-Fern-Grows-Teacher-Guide-by-Anne-Troy.pdf
    • http://zacdsa.linkpc.net/8c50c58c50c51c51/A-Midsummer-Night-s-Dream-Teacher-s-Guide-by-William-Shakespeare.pdf
    • http://zacdsa.linkpc.net/8c50c58c50c54c59/Merchant-of-Venice--Teacher-Guide-by-Novel-Units-Inc-by-William-Shakespeare.pdf
    • http://zacdsa.linkpc.net/2c56c56c59c55c54/High-School-Substitute-Teacher-s-Guide-YOU-CAN-DO-THIS-by-Cherise-Kelley.pdf
    • http://zacdsa.linkpc.net/8c50c56c54c53c54/Doctor-De-Soto-by-William-Steig-Teacher-s-guide-by-D-C-Heath.pdf
    • http://zacdsa.linkpc.net/4c57c51c54c53c52/Eating-Wild-in-Eastern-Canada-A-Guide-to-Foraging-the-Forests-Fields-and-Shorelines-by-Jamie-Simpson.pdf
    • http://zacdsa.linkpc.net/1c50c54c51c58c55c51/There-s-a-Boy-in-the-Girl-s-Bathroom-by-Louis-Sachar-Teacher-Guide-by-Anne-Troy.pdf
    • http://zacdsa.linkpc.net/8c52c58c54c53c50/The-Affinity-Designer-for-Windows-Instant-Professional-For-everything-from-illustrations-to-image-processing-this-Japanese-language-guide-to-the-powerful-need-Be-a-pro-Right-now-by-Akira-Kuwahara.pdf
    • http://zacdsa.linkpc.net/6c57c54c53c50/The-English-Teacher-s-Companion-A-Complete-Guide-to-Classroom-Curriculum-and-the-Profession-by-Jim-Burke.pdf
    • http://zacdsa.linkpc.net/1c51c56c50c54c59c51/Practicing-Presence-A-Guide-For-The-Spiritual-Teacher-And-Health-Practitioner-by-Eckhart-Tolle.pdf
    • http://zacdsa.linkpc.net/1c50c59c55c56c50c54/Introduction-to-Ayurveda-An-Essential-Guide-for-Yoga-Teacher-Training-by-Celia-Ebrahimi.pdf
    • http://zacdsa.linkpc.net/9c53c53c57c56c54/Incident-at-Hawk-s-Hill-by-Allan-W-Eckert-Novel-units-Teacher-Guide-by-Jim-Stelljes.pdf
    • http://zacdsa.linkpc.net/8c50c58c50c58c53/America-The-Book-A-Citizen-s-Guide-to-Democracy-Inaction-Teacher-s-Edition-by-Jon-Stewart.pdf

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