Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9695a1517861c7a…

MALICIOUS

PDF

50.5 KB Created: 2020-10-25 21:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5e37b2893706c4d6887a3af391196fa4 SHA-1: c84ffa5ee809264f39df466d4079d13c31a83509 SHA-256: d9695a1517861c7a8e55f855ca1551c748c0171f8ea61c5f6cd4d6a97ad32d2e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially garbled, includes text suggesting a free PDF download lure, which aligns with the malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic point towards a phishing or malware distribution 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.link/123?keyword=stillhouse+lake+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f88caed73e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5f943d81eae12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8709fe41e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f897bdd70cac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5f8df3d338a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8b26ed8796d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8ed3c92e97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5f90b2deeec77.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/2564413af4d29.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/cc6ab7016.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f872a061f2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f9053e8dd56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f93a262cc122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f8a4c19f3217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f8a4f8bc684c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f86fe937c581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f928ad109bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5f8d92dbbf005.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/baxunaf/spring_framework_5_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/download_free_textbooks_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/78744349602.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_off0000884a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884A 5296 bytes
SHA-256: 6e56bba36a66256e304bb52fda715ba5805de010ba8f8f16c41603cbb5015632
font_01_sfnt_off00009a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3F 10264 bytes
SHA-256: f0d3879c377e56fa901a723b1ad40f328405c9d86b24d1c8d15fcc2c9ecfa756

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