Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250b5466410799c…

MALICIOUS

PDF

351.7 KB Created: 2015-08-28 15:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 2a91aae719beec0c2522f1cb2f03315b SHA-1: 98458b4bf2bc1c2ad28c9a1768206de2716a2308 SHA-256: 4250b5466410799cdfbc6a0ea6b2c6c81aabbb2bf24be8b8a65bfab5fd92b011
92 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL points to botcraftman.ru, which is associated with malicious redirectors. No scripts were extracted, and the document body was unreadable, but the presence of the malicious link is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 2

  • 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.
  • 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%B5%D0%B2%D0%B0+%D0%BF%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0+%D0%B0+%D0%BD%D0%B0+%D0%BC%D0%B5%D0%BD%D1%8F+%D0%B7%D0%B5%D0%BC%D0%BB%D1%8F+%D1%83%D0%BF%D0%B0%D0%BB%D0%B0+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C&charset=utf-8
    • http://img1.liveinternet.ru/images/attach/c/7//4805/4805601_first__eagles__2_.pdf
    • http://img1.liveinternet.ru/images/attach/c/7//4805/4805496_yelchin__safarli__mne_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4804/4804504_vlastelin__kolec__3_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000538b2.bin
c41c7cde7654444aaaaefbf1442a79669a2d9737402cbff1a00df3b0fe561072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x538B2 8376 bytes
font_01_sfnt_off00055124.bin
51b88cc515129f0b30d0f67548c99014df55fdb8f8c289633e4246dabd595457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55124 14760 bytes

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