Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3877625b1099e06…

MALICIOUS

PDF

39.2 KB Created: 2020-09-20 16:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5f6d96d7f2e1f0e700bb9aae839abf9f SHA-1: 37adacf0efc93cab11899b8b3bc41f4c8486f7b1 SHA-256: b3877625b1099e060515897c326e1d02dd1f2296f1b7bd5e46ec562dfcd1e594
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing indicating it is a malicious redirector link, pointing to a URL that appears to be a lure for a military manual. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The file also contains a large number of embedded URLs, many of which are hosted on suspicious domains, suggesting a link farm or distribution mechanism for further malicious content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=falcon+4.0+allied+force+manual In PDF document text
    • http://vudonisug.ycinvited.com/uploads/1/3/1/3/131379163/nibujezo.pdfIn PDF document text
    • http://files.centralcocfamily.com/uploads/1/3/0/7/130738628/5596051.pdfIn PDF document text
    • http://files.fourthgradestingrays.com/uploads/1/3/0/7/130740049/7449715.pdfIn PDF document text
    • http://files.clearhrsolutionsd.com/uploads/1/3/1/8/131871786/d1eaed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c19b4353-3903-4842-b204-0cbe4bd57865.filesusr.com/ugd/b14caa_8cc3751fe9d2467e96d643f351d89144.pdf?index=trueIn PDF document text
    • https://dd585fae-3d5a-4439-b9f5-d8bb90b7adc4.filesusr.com/ugd/bd5c68_52a09fba934b4596b4cb1fd80f906de1.pdf?index=trueIn PDF document text
    • https://3b3f7c0a-681e-4289-a38b-ce1d2e09298e.filesusr.com/ugd/370b54_5c4ceb1afea746438afe085c1b7244cf.pdf?index=trueIn PDF document text
    • https://e3033614-8926-4a6a-8e21-c8dcf52b3276.filesusr.com/ugd/069df5_7144e6cc0f2349e2a690f27c19fc8c16.pdf?index=trueIn PDF document text
    • https://24d18891-bf91-4dff-a9b3-c82759bf3f48.filesusr.com/ugd/6e13d9_3309b5a90df341e990857d30d461f66a.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/bringing_words_to_life_beck.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97098861098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/44192887642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4224/5278/files/ximodazo.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_off00005b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6C 5208 bytes
SHA-256: cd75b5292f665e21cded7c105f5a1523788136b3f4d5f9fe75ff36781e9d628a
font_01_sfnt_off00006d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D18 10432 bytes
SHA-256: a207c497a40a7d0f9d7fe1590ae6fc0a576c2a6e665f787245bf6a73768c3a51

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