Malicious PDF — malware analysis report

Static analysis result for SHA-256 644174c99e0b538c…

MALICIOUS

PDF

47.2 KB Created: 2020-08-24 16:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f55346af7cae173830e26b28a8e579 SHA-1: c6895ebef0ec2338249e397301f0496087e7c42c SHA-256: 644174c99e0b538cdfd43865c570238b68cd69a454395f7fbd110879d5375f81
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical link directs to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious links.

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.cc/pify?keyword=aukey+dash+cam+dr01+manual
    • http://files.myers-adams.com/uploads/1/3/1/4/131453535/2967571.pdf
    • http://files.technology4teacher.com/uploads/1/3/1/0/131070846/mevonotu.pdf
    • http://kagiz.trafletfabian.com/uploads/1/3/2/8/132814930/kukepij-lepabevufuvi-navekagixa-punazosinukuvi.pdf
    • http://vapako.interlochenchamber.org/uploads/1/3/1/3/131384244/sususu.pdf
    • http://files.thereedsenglishlabradors.com/uploads/1/3/2/7/132710678/4040093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/susamotodobabibajesesu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/69179429293.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/negoga.pdf
    • https://cdn.shopify.com/s/files/1/0447/9424/9377/files/add_text_to_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/44324112544.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/mebifubevevi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8069/4437/files/dutujupixaguk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8334/9668/files/presuppositional_apologetics_stated_and_defended.pdf
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/pdf_beekeeping_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/bafetuku.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_off00006d32.bin
70f23d28e1c7cb7003ffa9ebe887f91058159da9857913cae85e8537d3fcd3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D32 5172 bytes
font_01_sfnt_off00007e9c.bin
8087101fd532b65ed8e2dfdea35945c77d675fe6a2d5579dbfd7d679614a4c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9C 10316 bytes
font_02_sfnt_off0000a1e6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E6 4324 bytes

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