Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ace292f0241e331…

MALICIOUS

PDF

87.5 KB Created: 2020-12-22 02:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ccea0c98face289db360dd76051ad9a0 SHA-1: e6ed7594d47174ea265d1690308672aee0ad82cc SHA-256: 8ace292f0241e331392e0028ce9cc40477945da111ef3b2a2f9cf12c1f109a8f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating a malicious redirector and a link farm. The primary malicious URLs identified are traffmen.ru and a weebly.com hosted PDF, suggesting an attempt to redirect users to potentially harmful content or facilitate further infection. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://traffmen.ru/123?utm_term=obedece+a+tu+cuerpo+pdf+completo In PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/vuvemofavanesiz_kunazekefep_betirumujazuber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5f9f7857ef6bd.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/3d006d79.pdfIn PDF document text
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/9d5458b5e4a8fc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fa00d48b40e3.pdfIn PDF document text
    • https://tojezupemizeraw.weebly.com/uploads/1/3/4/6/134629845/1872839.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/a30c01de-f8ee-4b36-97a0-492ff72f839d/can_displacement_be_negative_explain.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce9a437ba8b13540f2db0e/t/5fd72a9c9264095525ed5dbc/1607936669673/black_sabbath_paranoid_album_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb40851f-e5f9-4638-9f7a-4a00db30675b/44537797646.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/modern_romance_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc385f1c89e1c4b8fcf14f7/t/5fce4f2c5d2e6f3bda6c51b3/1607356207319/bofuvekakin.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/aptitude_questions_for_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306c2538-92c9-46ff-bfc4-4d87ac1dda83/33786548659.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd486d1091525336533171/t/5fde18e4f23a830a599fd15a/1608390885347/lararatasitiniwonexedo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe0158af67c863bcd193198/t/5fe01a0442c0045a3324b1c4/1608522244854/galaxy_attack_alien_shooter_android_1.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_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 5288 bytes
SHA-256: ea9876b6a14db0563da3a37f195ec54cdae6257a8f80e955e2cbd5c5410dbd02
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 13276 bytes
SHA-256: a2d2e0e6198879fe442bcf5fc1917e1c17ae157c7909f785ff6f37de01f84e37

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