Malicious PDF — malware analysis report

Static analysis result for SHA-256 77413cdac14edfff…

MALICIOUS

PDF

380.8 KB Created: 2015-08-26 20:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 88f53433940925f533c10ccef28e27f8 SHA-1: 6f252abd68265695554b653231fa25c33c206387 SHA-256: 77413cdac14edfff60783a44e21b68ee7366d3889afe15d3657a8504d6db0840
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the suspicious URL, which is likely used to deliver a secondary payload or lead to a phishing site. No scripts were extracted, but the PDF structure itself is indicative of a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • ClamAV: Pdf.Dropper.Agent-8995349-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8995349-0
  • 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 http://botcraftman.ru/?lip&keyword=%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D1%80%D1%8B+%D1%80%D0%B5%D1%88%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B7%D0%B0%D0%B4%D0%B0%D1%87+%D0%BF%D0%BE+%D1%81%D1%82%D1%80%D0%BE%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D0%B9+%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D0%B8%D0%BA%D0%B5&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/7//4762/4762604_the__stomping__land_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4762/4762961_minecraft__132__skachat_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4764/4764554_shema__yelektrooborudovaniya__kamaz_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005aa63.bin
2caa0fc762eb4e7c027bf70fc3896e6304eca07f7373a2c2d6ba2864c7c1c308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA63 9228 bytes
font_01_sfnt_off0005c3a7.bin
354403e53d75c0e7bfe32ab8449bcc445796493190cdad229173d81916856aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3A7 16024 bytes

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