Malicious PDF — malware analysis report

Static analysis result for SHA-256 a675c074159cca83…

MALICIOUS

PDF

68.8 KB Created: 2021-01-05 03:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 41ea80da0a1e0a34ecfe86160efe46a8 SHA-1: fbb9790daff7e25c0818cecb009e7cce3858f129 SHA-256: a675c074159cca8309822c887c184a59b68dff201ddc69ebdadaa5a6beecab85
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with one critical heuristic identifying it as a PDF_SEO_LINK_FARM. The primary malicious URL, https://gettraff.ru/wb?keyword=video%20call%20santa%20apk, is flagged as a malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, suggesting the document is designed to redirect users to harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/wb?keyword=video%20call%20santa%20apk In PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/1134483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fcab21b7f7db.pdfIn PDF document text
    • https://cdn.sqhk.co/zitajazasu/eWHGgiq/26651773322.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/hh6ePhc/100_best_boxing_games.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/pegek/46580463304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e063a75-e86f-4d81-911e-2b8345d3135c/ruger.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/15717872709.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/cannoneer_and_blade_bearer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/hotmail_login_problem_today.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/nccn_guidelines_glioblastoma.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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 5000 bytes
SHA-256: 9003458fc336f796639f61ee3c756e174fe0aa6a7a476772a0b9fe0f915d6bf5
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10328 bytes
SHA-256: 9963e7c5640c117b2619d324c8ae3b42c497992feda2ea68764fcfb12f1004b8

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