Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa7bdc4a5aba97a…

MALICIOUS

PDF

71.6 KB Created: 2020-12-19 01:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 223e59feda01096350d5381a6b14b38d SHA-1: 223ec42d190703529af96592c39192666f600165 SHA-256: 4fa7bdc4a5aba97a4f8ff5995f3af2d3bb7b0c5f8d4b7ee5c09c7e3efb245750
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=how+to+cancel+twitch+prime+2020'. The document body, though heavily obfuscated, contains text fragments suggesting an urgency lure ('account will be terminated', 'action required within 24 hours'). The ML classifier also flagged this PDF with a high probability of being malicious. The combination of these factors strongly indicates a phishing or malware distribution attempt.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=how+to+cancel+twitch+prime+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5fa289cc565a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f8bb1bc64fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_5fc05201ef257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5fccb1f8eb830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f890a488d09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fd32941b24d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_5fad29bf84162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/546672d8-56fa-41e9-ace5-5e791b854765/lasonuwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d0d6bd14ff0dd2a325bf/t/5fcc1eb15177ea328cb199e9/1607212722706/gelogipigojek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc971c8c741314319700/t/5fc2db7e9ee0f32b87b23126/1606605695061/futanari_sex_doll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd3bcff-e61c-4b02-9eaf-4cb9a6eca976/55343216286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319df298-ea5a-44e0-b415-2b140ce2b3a4/30329370238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64d6d2e537a05ef2dd678/t/5fd1d435ad61ab58318bd6da/1607586871271/easy_movie_quiz_questions_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc72d5643c5ee75bf2ae53d/t/5fcee94864290b1c3dc9a7fe/1607395658177/44418419454.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 5112 bytes
SHA-256: 5345cc67e305f6e32b1a567f423b16eef75993ad511d79644673b2d7ab49bc5b
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 10452 bytes
SHA-256: d543884a498182f7cc9984a0cead37c2fff755a97e38d3da84a99667c5cfceb0
font_02_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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