Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f21cf3a06d8b556…

MALICIOUS

PDF

40.9 KB Created: 2020-11-06 07:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0ac57acdc6f20ca1c8872359377dd3f4 SHA-1: 190897e5fd9b768d62382bcdfe2b0fd8bee16695 SHA-256: 4f21cf3a06d8b55632fee939ca03a62179cba404ccfe2493d7080f0c93d3c8f8
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document structure suggests it's designed as a link farm to direct users to potentially harmful sites. The presence of embedded URLs and the malicious redirector link are key indicators of its attack pattern.

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 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://traffmen.ru/strik?keyword=m4+army+study+guide In PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/8a85ac33d.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/rapedemoxilor_rukofuwaladopof_xojozadavex_feriduzijufol.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/litozugaxuga.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/ee581f944afe5.pdfIn PDF document text
    • https://galafiki.weebly.com/uploads/1/3/4/3/134347291/3949418.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6922055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392463/normal_5fa353a3319a4.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/jirozolane-zupegovutikix-tofowabunipur-suwizuvised.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/zerejibixupav/beats_x_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/adverbs_of_manner_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c186818-5bd3-42ab-ad27-e42be61822c3/27022364907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7985558-7315-4b00-a61d-13c6709836d2/furubulosulabixaxabu.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/slr_assumptions_econometrics.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_off000061f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F9 5308 bytes
SHA-256: ba049f2a0d638f438055f6df1a8506379af53fe92cdcae8baf7a9c7b6b628210
font_01_sfnt_off0000740f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740F 10376 bytes
SHA-256: 8a667136232ee4dd37bf9adbd6e02498c3784c607f78bab80451e3af04ca06d8

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