Malicious PDF — malware analysis report

Static analysis result for SHA-256 afef5824b949e5b2…

MALICIOUS

PDF

345.9 KB Created: 2015-08-21 09:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: fbe99c88a1a1cb3c5313776b0d3afee6 SHA-1: 16ae27eb7c88a702f73c989f0cf34535d3a83540 SHA-256: afef5824b949e5b24b394bda46be5771038fe50cc1ddd461edcde37797c34ba5
98 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a known technique for delivering malicious content. A critical heuristic identified a link to known malicious redirector infrastructure at 'http://botcraftman.ru/'. This suggests the PDF is designed to lure the user to this malicious site, likely to download further malware or conduct a phishing attack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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%98%D0%BD%D1%81%D1%82%D1%80%D1%83%D0%BA%D1%86%D0%B8%D1%8F+%D0%BF%D0%BE+%D0%BE%D1%85%D1%80%D0%B0%D0%BD%D0%B5+%D1%82%D1%80%D1%83%D0%B4%D0%B0+%D1%8E%D1%80%D0%B8%D1%81%D1%82%D0%B0&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/6//4654/4654713_koduy_mkb10_dlya_skoroy_pomoschi.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4654/4654694_shkolnica_3_torrent.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000524e0.bin
b00b001e57f3cf8115e15ecf12a5d0afe1c7dc7092f1bcb9c59fb659ccda552c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x524E0 8424 bytes
font_01_sfnt_off00053cf3.bin
302e541dc2b96c5f6b4a8d19fdd5de257c43a250e74772a036be30a65ff1fdf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CF3 13708 bytes

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