Malicious PDF — malware analysis report

Static analysis result for SHA-256 864465f905f8d35a…

MALICIOUS

PDF

86.8 KB Created: 2020-12-28 07:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9b4218620acda6f7570843335e892c90 SHA-1: b855d5fa054b5ae3ab2d0b721754413068e7b682 SHA-256: 864465f905f8d35ab0b206676f530a2118159f101aa0e92eaf295b141adba122
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 'traffine.ru', which is likely used for phishing. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to lure users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=logo%20quizzes%20hard In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fe0819027f87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fd07b28ccf5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fa8513c8687f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5f8ea0a8993e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fdaefcaec435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5f931b44e6a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fd2da128daad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_5fd7a1aca93df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fbf033969fb2.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/e2b41faa-c686-49b3-9239-a4b140fadf48/66027559052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e739f293-6407-4c36-a4b8-2fb898234837/75621719715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58097be-4ea6-4f7d-8ddf-4c687790aa3a/a_modern_approach_to_regression_with_r_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f967de2-68a4-492f-9e26-f92681fc4d3a/toon_cup_2019_poki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63248cbe-f8de-45a4-bc66-ace30b7e7df6/93518091983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27738af7-21c0-4006-81e4-01ff4050181b/2015_junior_miss_pageant_nudist_cont.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_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 5172 bytes
SHA-256: abb8d99d174912e455aed507a42f8d5fb81fdd55e00734db1036b12c150d45b0
font_01_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 11652 bytes
SHA-256: 806b3b2e8ab3497fbb66a89a4f0de9644f4bc9e2117f81efdd76421d9cf29ec6

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