Malicious PDF — malware analysis report

Static analysis result for SHA-256 408aa8be3c72282e…

MALICIOUS

PDF

60.0 KB Created: 2020-12-17 00:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 21cd34ee10da18cbdd18102e5acaf3d6 SHA-1: 86df0c8154717c674a31c924bbc8b357be3f9c2c SHA-256: 408aa8be3c72282e623ba3970b50726e6b7281e3eca724a5f1e3324785953e2b
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik'. The document body, though heavily obfuscated, contains text related to a school bus schedule, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • 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/strik?utm_term=foothill+high+school+palo+cedro+bus+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_5fb6789dcb4bf.pdfIn PDF document text
    • https://zafuzumu.weebly.com/uploads/1/3/4/6/134674349/xofuxesoxagonozudad.pdfIn PDF document text
    • https://besukefovubon.weebly.com/uploads/1/3/3/9/133997228/4376687.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/d12d3939436ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5fb3621518694.pdfIn PDF document text
    • https://wikamarelifegef.weebly.com/uploads/1/3/4/3/134380256/momaxajelixazaxikom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5f9e01116e36c.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/ccfcd3ec-2bb7-4c73-8cbb-b5503429538c/zuzipijuguwufimeruri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845da63f-20fc-456b-8511-bbfaec5cd2a9/nawarusanijozazidoden.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/tawipel.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/11393818865.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/palmistry_in_telugu.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_off0000ac4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4F 5432 bytes
SHA-256: 003e02e32c0cf96a4330ca21cc27552c2a194e7a5d0b1f8b1fd9e81b07693bc0
font_01_sfnt_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 10064 bytes
SHA-256: 44866781182282f7957dff707ae0f4b0f8007234407d12d0eaecb2c7037c8ffb

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