Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9915cd50beae830…

MALICIOUS

PDF

58.3 KB Created: 2020-12-09 19:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46884298f64eb5d3983f50b5b9183103 SHA-1: 56e051dde7c52eed814975b75943507e2fc87eb5 SHA-256: a9915cd50beae830d3c3586e8433d3a32ab4f8acd5bed57fd03191ede56e75da
162 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 'https://cctraff.ru/aws?utm_term=birthday+roses+hd+images+free'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=birthday+roses+hd+images+free
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc87df536a82.pdf
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f9ba4398c6a1.pdf
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5fc06e6085a0e.pdf
    • https://cdn-cms.f-static.net/uploads/4407991/normal_5f923d76bcc2c.pdf
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5fcf67021432a.pdf
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f9b0eae8f21d.pdf
    • https://cdn-cms.f-static.net/uploads/4447271/normal_5fa7a683a4bf9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jopomodilamego/xomoxow.pdf
    • https://s3.amazonaws.com/mijedusovineti/59884725852.pdf
    • https://uploads.strikinglycdn.com/files/9e0a36fa-86a5-4ff1-a057-f2e920a04425/40729907574.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd13ed31dcc34bf48d61e7/1606226926023/oval_bathroom_mirrors_lowes.pdf
    • https://uploads.strikinglycdn.com/files/4ba53441-6319-40e6-b2ce-eeb1b695b866/kewelexasovaku.pdf
    • https://static1.squarespace.com/static/5fc568dc239b0722914f7edd/t/5fce07bacded405bb8fe4b59/1607337917021/personalized_cake_server_set.pdf
    • https://s3.amazonaws.com/tapelu/98365924347.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac72.bin
355cd91768b925dd946bea947a135e368d8c134c8cfaf564d043301e9e7ac1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC72 5440 bytes
font_01_sfnt_off0000bed5.bin
7ed5539cd9adcc5a3c481c20857cf4be5737e9aeb64c3af27821671fef548b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED5 8764 bytes

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