Malicious PDF — malware analysis report

Static analysis result for SHA-256 84475a00776bd3da…

MALICIOUS

PDF

50.8 KB Created: 2020-10-28 11:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 55533a384f2f452ed2526aa3746984c2 SHA-1: 2d8457c9aa6a6cf3b86feb71c1fb15e6ec775462 SHA-256: 84475a00776bd3dafe50b34dd25ef05f480b2c19895e79fada1b824c96588ed5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=university+of+minnesota+school+of+dentistry+class+profile In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f95d7ce89771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9276b9b0471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8f928b684f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f8ad5ae83f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f910c33d045c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f9508900da82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f92f955bb1fb.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/wawepobapike-tawiseburezef-fogabomazeba.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/miwuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f8a12576838a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f94c09be13b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f874d3a3fbee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8860b68b7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f8a3e778d6b3.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/zetare/xomurepizokaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/formal_language_and_automata_theory_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/81908480509.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/celebrity_cruises_classic_drinks_package.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/10194020377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee55a6a-07d5-4d0b-9375-c40cfd428be1/xifume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7252e2fe-2237-40bb-b262-5160a3800299/34035936142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ace138-b0e5-40fe-af25-3df80066c158/pujobimuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0926861c-6ff4-460d-8e2d-55edefe71678/75755121312.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_off00008538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8538 5548 bytes
SHA-256: 4b686e57a1fbd0d36643325b69eaeda9f0ba982365443c6236d1597b4c434589
font_01_sfnt_off000097f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F5 10852 bytes
SHA-256: 29bc41f990f4ede0a6a942a6134c1d6f7de50ee950a71087c1945669be585ff4

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