Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6819dc5b41f7292…

MALICIOUS

PDF

40.2 KB Created: 2020-10-30 22:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b39971913f09d34a471a1c6195fba7f8 SHA-1: 9fa775b9315a7775883bb9655f04c2e1331140b7 SHA-256: d6819dc5b41f7292d461558dc9bd04901dc2fada85a86b58f21470758eeff037
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.club'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass external PDF link farm. The document body, though heavily obfuscated, contains the same URLs, suggesting the primary purpose is to redirect users to malicious or SEO-manipulated content. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a malicious redirection attempt.

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/123?keyword=pas+requirements+and+wfhm+offer+submittal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f871c6dbb883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f92b505edac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f9b7859d0777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8778427b114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5f9bd9c672f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f87dbd728942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/vuvomizeledorugutategoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/60575914161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4447/3498/files/dogimifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74062ca-2edd-43de-be86-da5f82c947d4/vonitowurutokalonobejufik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646eee99-8771-4d0e-b917-fff4d0246249/83912543513.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_off00005dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 5504 bytes
SHA-256: c833c99fc51b66915cdd8863655acf4378368f27a2db95d903023b4425c2a0b6
font_01_sfnt_off00007050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7050 10400 bytes
SHA-256: 0e99cab1b68bf8fe11413ac0188c2190d2211116b823295c1e10d0615c366520

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