Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4c08d1165f2f54…

MALICIOUS

PDF

64.6 KB Created: 2020-12-13 21:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a17a6081b28c3add91b8e1a743368f8 SHA-1: 7b5709aa82822570a742c518678d9c7a71dd74ff SHA-256: 6f4c08d1165f2f54202f37f87a5fd93fad12d98c086f0cbaea4b0bb926298894
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://gettraff.ru/aws?utm_term=school+dingbats+quiz+answers'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to a 'School dingbats quiz answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=school+dingbats+quiz+answers
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/befekivipudo.pdf
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/4946048.pdf
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/a62e49b4a.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fbabe85879ca.pdf
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/555253.pdf
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/17a2afeda45180.pdf
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9c9809c1875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc706dc8651a04751958791/t/5fceb5de6df3f351a66c2773/1607382495969/surf_racing_board.pdf
    • https://uploads.strikinglycdn.com/files/df96635a-4ebd-4ddc-8642-d62fe9bf7873/lekugubifisipete.pdf
    • https://static1.squarespace.com/static/5fc55ad4085bf90c0e1ac87b/t/5fcfca0515c1b81ea4e0f577/1607453197547/zijeden.pdf
    • https://uploads.strikinglycdn.com/files/e889a1ad-ae44-423e-af9e-a47b061eaf70/regibigusugogonegeme.pdf
    • https://uploads.strikinglycdn.com/files/6226e93b-cf6f-46e7-a33c-97c150e4146b/ova_ovf_hyper-v.pdf
    • https://uploads.strikinglycdn.com/files/7d284dee-661c-4bc4-acae-cfd876ae0eae/forever_21_interview_questions_yahoo_answers.pdf
    • https://static1.squarespace.com/static/5fc566d10b6b03258f537d87/t/5fc840bd13f8d93bf2fe0e23/1606959295159/picmix_video_app_download.pdf
    • https://uploads.strikinglycdn.com/files/355314ca-3ab9-42e7-ac9a-6b9dabea2ad5/equity_asset_valuation_3rd_edition.pdf
    • https://s3.amazonaws.com/tobobowu/36299277110.pdf
    • https://static1.squarespace.com/static/5fc67aea084698658e84b086/t/5fc80c916fa82233f6a12545/1606945937570/58329152360.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4d.bin
4c728f5d5c2ec89d3125b944390f31c98c72c27392356b2db1c5de20c7c6fa44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 5712 bytes
font_01_sfnt_off0000d0c9.bin
377538cc7eef302cbb5b988b69c59b199a37cbf50284afbf21e44a36cd06d5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 10688 bytes

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