Malicious PDF — malware analysis report

Static analysis result for SHA-256 86071594ac93c54f…

MALICIOUS

PDF

38.5 KB Created: 2020-11-01 23:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: da1b9f9a7647a0ae79a677b3375015b9 SHA-1: 24accf3e550f72032b8a3d3dc7e4f7ed364a0315 SHA-256: 86071594ac93c54f727d29b8e95eee4ef95c972144d13605f13bf095be8d6065
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://gettraff.ru/strik?keyword=pp4218a+chain+replacement, which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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://gettraff.ru/strik?keyword=pp4218a+chain+replacement In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f8f8ffc78c72.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/9097709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8ba4f74115e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5f972d9b10975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f907cd68ec38.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/b089515.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/7102566.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/1132172.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/5724279.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/889202de-b4a3-4944-8957-07d15563c083/medidas_antropometricas_del_recien_nacido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf08675-0af1-49a1-ba5d-70d9c53ce452/jivefagoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509886a9-26ab-4b28-b0ef-b1580ae29d02/munifosetafusoxusigene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3463679c-9efd-4927-83e8-4e34ce8a08c8/83402787993.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/92764519353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc6281d-8e5e-4d94-9e42-794da40ccaae/monos.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_off0000512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x512B 5460 bytes
SHA-256: 529d44a42a54d53729424c4ba2a546cf8ca5aaf24feae2ec4a8e02ec3d539bff
font_01_sfnt_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 12152 bytes
SHA-256: a113fb2a399ac4b5369cd6c4f59ef3465c0571929730133d58bb890644372eaf

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