Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a46d8e7b228030…

MALICIOUS

PDF

89.2 KB Created: 2021-01-13 02:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b55d5ead24ac482841d130c96e2846c SHA-1: d340b4570477c6be0a0fdb894d541e768c2d94fa SHA-256: 83a46d8e7b228030252a4d0beed6eefa5c0616dc66492d3e54699f908aea414e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. This, combined with ML classification and ClamAV detection, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=bleacher+report+fantasy+basketball+mock+draft In PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/gKX3jdA/bezobadagavemakibafupone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5ff195c54b3b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fca90a47feb3.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/eHhi6pe/american_civil_war_history_movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fda5eb80d343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5f8e3aa59f6bd.pdfIn PDF document text
    • https://site-1193936.mozfiles.com/files/1193936/5746195977.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/ifSDyhh/nifebejalawoworow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5fe3ad24ca4cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fdb2182ea365.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/saxefi/ielts_adjectives_and_adverbs.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_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 5748 bytes
SHA-256: 1636681ee14d8fe155192e483ae7d05db7811e2267fa326a8f3150732ca223dc
font_01_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 10852 bytes
SHA-256: fc2f95f8ca02043ac423ac22b2374e2bb962994e503753a6f6d56a1dfe9c422a