Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c76528a905a414d…

MALICIOUS

PDF

88.4 KB Created: 2020-11-10 08:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d1214160e7d69953ac8149eb5d323023 SHA-1: 787aa5e1d089074fb84b3f96b39b183b5ea21e43 SHA-256: 8c76528a905a414dda97f6fb4fd60aa82b2ab09789deb6f6e9f4bfde732a8578
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious content farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to 'traffine.ru', indicating a phishing or malicious redirection attempt. The 'PDF_SEO_LINK_FARM' heuristic further suggests the document is designed to host numerous links, likely for SEO manipulation or to distribute malware. While no scripts were extracted, the PDF structure itself is weaponized to deliver malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?keyword=iowa+high+school+football+finals+in+uni+dome In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f8c5ca642f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f914ae02e931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5fa310d6b9b69.pdfIn PDF document text
    • https://zubujaxu.weebly.com/uploads/1/3/4/5/134585886/fizajuje-bogerul.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/vonosokodi-tagiwirumaxojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f8e2bee25a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f92915cc9b78.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/19ddc57ae643e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f9dc81f8b861.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/mokemuramojala-fugovumetu-tizopozirad-zerewew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454046/normal_5fa30cf780115.pdfIn PDF document text
    • https://xosotemup.weebly.com/uploads/1/3/4/3/134367608/fujituxefuxedixer.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/felasorarabipis/relanuvofakelisoxepewi.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/high_gloss_kitchen_cabinets_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/pesomopenotajub.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_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 5508 bytes
SHA-256: 17d6529267c87e2bb54f20fe3161cbeba2e0442cd91a2cf4914e53ce9f95dd01
font_01_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 12172 bytes
SHA-256: 351055e15dc2ff1da04b2c50b1e05ce71baa26eaed32bc483df2f7f848fd80c4

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