Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa1644e8ceda90a…

MALICIOUS

PDF

60.6 KB Created: 2020-11-10 12:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5802bb491a5febdef694824d3ea47b34 SHA-1: bce83d6539dc093635384e19f16e3ef2582df64e SHA-256: eaa1644e8ceda90a7a2ddfc3d1ba00294af2aa289c9f98203e60baeda3f131c1
214 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with a critical heuristic firing for a malicious redirector link to 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?keyword=tower+defense+unblocked+66 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5fa0731e7e3ee.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/055b5834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87fa79a8268.pdfIn PDF document text
    • https://suguvojonejufo.weebly.com/uploads/1/3/4/5/134585364/5ea9df8636ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5fa5acff5caca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f8e1bd989239.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/f2a82215a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5fa730c75df5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5fa0b1fddd71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_5f9f56074d162.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/rululesowaz_siwafu.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/1829a130-3cf8-416d-a23f-74927b8d8b59/sepirejenan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73129e8-5fad-42e6-8625-5446f8c115a9/suxerigodukuwuwijaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5ccd0f-138e-42ab-ac61-76716a24b77f/winejowekedenasitumiwup.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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 5204 bytes
SHA-256: 62e40f620280bc80a86f2a9d0cb0992928216652c17d4c0da5d78c20f3485666
font_01_sfnt_off0000c2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AD 10332 bytes
SHA-256: 9aa095770bba3a2483bb660585cab52b1daf0e53ceabc85cc9b026b47d11759e

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