Malicious PDF — malware analysis report

Static analysis result for SHA-256 720921aa55dcd7c0…

MALICIOUS

PDF

62.5 KB Created: 2020-11-09 19:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 090127362c08a79c7e135a9daf3cc388 SHA-1: 17cd820ca2369f61da355ef5c5356f7a14eb47e0 SHA-256: 720921aa55dcd7c008fb1d7c47992ee8b837bc150f903ec177a39daf7c46157d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. While no explicit script was extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

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/strik?keyword=direct+finance+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8b912d0e600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f95d17e42c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f9474ed8156a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f97b310ae8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fa238f3296f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_5f95bf897ec5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5f99d21374328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f9e802b8bb00.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/921d305a-fc35-49f9-b583-69dfd29a6d03/1934503516.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/jifawubeteraxupil.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/gewurokunakovuwibeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e7302c-43d9-429f-b46b-98b1e5b17ee3/zadametosoxogatusax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/312afd92-ea34-4e19-a925-13056a0b7cae/23809604944.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/safulepodipe.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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 4804 bytes
SHA-256: c76dc81068482f4a5d1c1cf59d15cc2d32e2b69abf1d947a535070e7af413ee5
font_01_sfnt_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 9508 bytes
SHA-256: 61279bd27480350376f33259613bace0f9b5738cbbd8c0afa8405baa54ecf6df

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