Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef8694a6c584e3c…

MALICIOUS

PDF

45.8 KB Created: 2020-11-04 03:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5b7d5c7d40424fc70deb92c00805f27c SHA-1: b8ef43e0f87385499d61f6f34a5d402b875ea59a SHA-256: fef8694a6c584e3c4190d852b616c40681812de28b6a7208f5919db4def4a9cd
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 URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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://ggtraff.ru/123?keyword=orc+warchief+5e In PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/a651ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f989fd5da4db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f92ed067e6f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5f94adf4d9c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8ba301de687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f9dbb746963d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f895e1b2137d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5f8bb4d5c74ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_5f9d4f2688000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8c04e83a2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f9604dbc89aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8ede91-5c85-4f82-aa55-52f04f574f40/guwoguse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a571f32d-7417-499e-8d4b-aa2d76de2e2f/fisegemifapizifigikag.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 5000 bytes
SHA-256: 57498fe1f4a9028e6c057911a535e7aa8d8f7048ac5492b4f59bf23ff79a98e5
font_01_sfnt_off00008781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8781 10256 bytes
SHA-256: 3fd0bb29fd7a168196d2aa5f03ddc6c51f4b8a5d4e574b04993564d4926d30b5

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