Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab32d5018f0edd5…

MALICIOUS

PDF

57.6 KB Created: 2020-10-09 22:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8c83460b2fbc0c2170a75710b9bb2d0d SHA-1: e888dbbe32bd9d00c1961606bbc9bd2136545a87 SHA-256: 3ab32d5018f0edd5855a28cd3d91a919319ae32456f7d2b64796f70a6220be0e
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?keyword=edge+exercise+bike+manual In PDF document text
    • http://files.elementaryexpertstutoring.com/uploads/1/3/1/3/131381036/2704136.pdfIn PDF document text
    • http://files.brianjamesshaw.com/uploads/1/3/0/7/130739769/sukulexalalodo_jenux_gopazupurumow.pdfIn PDF document text
    • http://files.watsondentallab.com/uploads/1/3/1/1/131163917/gizepevufevod_gisixex_morad.pdfIn PDF document text
    • http://lakivu.createinteriordesigns.com/uploads/1/3/1/3/131398285/dotemadal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5088/4008/files/lutuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/9785/6674/files/igcse_chemistry_acids_and_bases_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/tiwufinejexekotorajivebiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/duncan_parking_meter_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/49096416444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797b676b-7e11-4d25-b16f-6e4b83c3b18e/75988259566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d4dcdb-8e20-4490-ba0b-2615c6fc4d4b/11747868712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a919eb-153c-4a15-938b-15f3f048f9b4/xadigagewunotezanuzeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc2bfe5-f9c1-46fe-a53e-4fe28fa48bec/sokozatuvotiwuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58df14e-d308-4e4c-af8d-d28145ec94e4/82052816172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ee6f52-95a5-452f-afaa-e083ec07c90a/pomovuguvolimex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec51c14-0b1c-44b6-aab9-43f80b8be53a/76345248822.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA285 5488 bytes
SHA-256: cc510c15e81e1a2cdd36f4532451bbb159c3a5940545fd0a9e822b9ddc9e48f8
font_01_sfnt_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 10720 bytes
SHA-256: a9b5cb4adbdfdc599ca2ae857c247dfabd379dc6df0aeca2d2c278d9a96d6439

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