Malicious PDF — malware analysis report

Static analysis result for SHA-256 a931be95674b9b0d…

MALICIOUS

PDF

42.7 KB Created: 2020-10-29 13:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fa0e070d02f3fa5b1bbfecdda9376263 SHA-1: 154e3c2c97ec5a45a27c969c2c523711f4af47bf SHA-256: a931be95674b9b0d288ffe811e2dfcee1d54148b66e49534eb7415850f0df234
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or redirector infrastructure, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the structure and heuristics suggest the PDF is designed to lure users to external sites, potentially for SEO manipulation or to serve malicious content. The ML classifier strongly supports the malicious verdict.

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://cctraff.ru/aws?keyword=crowders+mountain+state+park+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f8cb3ae70328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5f9a72c63ca23.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/julasuj.pdfIn PDF document text
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/mowesosiwexaxojepodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8a9bd5dec63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f871a4434766.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/xusaxog_tabipox_potorobakude_milulogufasabof.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/b9db8623c.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/76cc774d0a.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/5756966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f9115d159f54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f90d0396e9a2.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/be463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f88d3296705a.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/takeju/what_does_un_poco_loco_mean_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/9287635426.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/79510749440.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/green_roof_types.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/newuwubowaxabuliwusamepuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/protein_structure_textbook.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_off00006714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6714 5132 bytes
SHA-256: 191c1f81fa2c93c0e6d658a418ff0dc71b23b42937c1f2b5d4e7767c0b5034fb
font_01_sfnt_off0000787c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 10820 bytes
SHA-256: b8be1e655e084ab8e29acdb971ba09f6a6907ddbb38e150548bb55406a814866

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