Malicious PDF — malware analysis report

Static analysis result for SHA-256 86358378a505d3ff…

MALICIOUS

PDF

67.1 KB Created: 2020-12-14 02:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2f66acdd4b6410a61241eaa91f5f556 SHA-1: 682d18c3dc1235d0872a3c33cbcedaae96fa7571 SHA-256: 86358378a505d3ff74d3fd917dba12beb4b657e6696b9c83d83bd6e925b40bb8
214 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, specifically 'traffking.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'guide'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=coin+operated+crowd+pummeler+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5fc553e14ca1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_5fbc7684b4866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fa65ec4db534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5fb40b3a73a3b.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/87dbb8e06a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc56ac1a879396864266ef9/t/5fcb82ce21c0486e9195c7e2/1607172814527/wozejogo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3051916f6d44b07cc8110/t/5fcc885f5177ea328cbbf1f9/1607239775323/hungry_shark_evolution_cheats_codes_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1559bc6d9645836252c59/t/5fc4137cf3de5e49b5e44a67/1606685564592/69218981978.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/posagexamigevegul.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/36664648154.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/bobabajozirogiligovopasun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c697bda9c57a97c4683c/t/5fd060263bcf75077a811c73/1607491625032/62467851386.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_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 5212 bytes
SHA-256: 1f3be090432848f4774f6a6fcf1ca75d98f1f93dc3cf1646371312f8ae725b71
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10688 bytes
SHA-256: 1443f68f0d06f56ede712f14c4897f256b92fa00adfa978db39aac76b03960d9

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