Malicious PDF — malware analysis report

Static analysis result for SHA-256 2733b4dbefe50805…

MALICIOUS

PDF

31.5 KB Created: 2020-09-18 13:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbcd60661894ed515c8034692c74f6a SHA-1: 9d14d9b8e421068b0ebf1c727e07c8f2f3292a39 SHA-256: 2733b4dbefe50805d9efde617f71bf8b8614dc42992c4b1bcb66c9139ebe9412
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as homework solutions, which the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic identified as pointing to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a pattern of hosting further malicious documents, likely for a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://ttraff.me/wix?keyword=accounting+2+chapter+3+homework+solutions
    • http://files.roberttrescott.com/uploads/1/3/0/7/130740510/vawetox.pdf
    • http://xawimov.sonnerphysics.net/uploads/1/3/1/4/131406427/kolovumivazo.pdf
    • http://zurex.secondhandlife.org/uploads/1/3/2/6/132680949/sabet_detiladeseb.pdf
    • https://cdn.shopify.com/s/files/1/0459/1216/2453/files/employee_termination_letter_format_.doc.pdf
    • https://cdn.shopify.com/s/files/1/0455/6220/0229/files/mizuduge.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/64334296324.pdf
    • https://cdn.shopify.com/s/files/1/0460/1869/1239/files/alphanumeric_outline_template.pdf
    • https://341c7bf6-bde6-4147-8879-42113c70b5ea.filesusr.com/ugd/0789d5_8fa301cabdba4140a3c21688780573da.pdf?index=true
    • https://494d5c9c-3482-438d-8bf1-f9182e84b8fb.filesusr.com/ugd/f1780b_5087df127cdb48dbbef7aa78271659ce.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f03.bin
f726f10b514834603a6d0cd1733214347045f67693e1a196c4d3d8f5b8fd8b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F03 5788 bytes
font_01_sfnt_off000052a3.bin
4ae60d5e796830662d41f13f040172e02ec1b056545708238b318be2011f7650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A3 9140 bytes

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