Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f3a8b6e427bcc…

MALICIOUS

PDF

45.9 KB Created: 2020-09-07 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381504f37025263b987bc384f176539f SHA-1: 6d01dd4351d17f847165343ec4d0a5672bf24e59 SHA-256: 0a3f3a8b6e427bcc5c5881ff4ed778ed0d8903ec6504f00a5697f7819ed38de6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, 'https://ttraff.club/pify?keyword=chrome++64+bit', which is designed to lure users into downloading potentially malicious content. The document body, though heavily obfuscated, contains references to Chrome and a URL that appears to be part of a link farm, suggesting a social engineering tactic to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://ttraff.club/pify?keyword=chrome++64+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1df9ea_6e0a7b50824b4fdb9cb1f6a225143bb8.pdf
    • https://static.usrfiles.com/ugd/3b47cb_7c9729ad26a04617906d3198121f22c8.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_410fc1535eec43768c8f9a90250a76ef.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_51c38ca47085455b9b0ef04ad772a2dc.pdf
    • https://static.usrfiles.com/ugd/e745be_93dae60acae648b0b063d5e14777cc5f.pdf
    • https://cdn.shopify.com/s/files/1/0439/3821/8152/files/93199942354.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/50878219334.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/zuluziladazafameseri.pdf
    • https://cdn.shopify.com/s/files/1/0465/2485/8526/files/topetekepuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/laraxevijuponu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/70340000139.pdf
    • https://static.usrfiles.com/ugd/9ec29b_9b94ca05c9bb45e59fe518e695cab3d0.pdf
    • https://static.usrfiles.com/ugd/5a4aad_80176525822542bc9d51d6597291f241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683e.bin
941c87e45f616797b1d25a6bdd32d605412d84253a729e2ba8b502f65b213381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683E 4592 bytes
font_01_sfnt_off000077e6.bin
eb282cb5376c5ab49ff573959eea2c6628ad7094f6a8bf03d22feb64e7b76e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 10908 bytes
font_02_sfnt_off00009d15.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D15 4324 bytes

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