Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9532ddaa046b300…

MALICIOUS

PDF

26.9 KB Created: 2020-10-22 11:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ba8b732cbab54f460b37da2dda80954 SHA-1: 0b917137c49cf5443ac38b51631567785b394fb6 SHA-256: f9532ddaa046b3007ff353e312303892faafe16d5cd24365081733869dd0eef4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/123?keyword=free+verb+tense+worksheets+2nd+grade, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for educational content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • 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.
  • 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.ru/123?keyword=free+verb+tense+worksheets+2nd+grade
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8fb87c710d6.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f874bd1a75ca.pdf
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f911c34b8587.pdf
    • https://cdn-cms.f-static.net/uploads/4393624/normal_5f913d49414df.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/947c01d8c12.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/guxiz.pdf
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/xopevaxeluvakik.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/jarakaledo.pdf
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/fososolixij.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/muwik.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/robiruzekukebujog.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/8697464.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/gapunir.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/nixomaz_gagaxe_xafelujevonof_woluwapomewema.pdf
    • https://cdn.shopify.com/s/files/1/0499/3328/7592/files/komidazejumod.pdf
    • https://cdn.shopify.com/s/files/1/0486/5648/2472/files/16988724985.pdf
    • https://cdn.shopify.com/s/files/1/0484/3103/8616/files/mitenatikujadiwulokalajog.pdf
    • https://uploads.strikinglycdn.com/files/ecaf6273-6239-4066-9c17-529eead865b7/52128944174.pdf
    • https://uploads.strikinglycdn.com/files/fc7f7e1f-0d9c-49fa-ad69-887c49cc882f/78519292149.pdf

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