Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c90625e0fbf977…

MALICIOUS

PDF

344.5 KB Created: 2015-08-28 17:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: f4491fa7845a13a7850f8d2f9ff45e7a SHA-1: 9190e669c284e80e075a7eeef709028c073f8477 SHA-256: a3c90625e0fbf977d2d6f6d34d80bf4350b66b848b839fff6d0ea780630cc76c
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link to 'http://botcraftman.ru/'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the embedded URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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-8071651-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8071651-0
  • 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=%D1%84%D0%BE%D1%80%D0%BC%D0%B0+%D0%BE%D0%BA%D1%83%D0%B4+0710002+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/7//4808/4808288_obrazec__soglasiya__sobstvennikov_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4808/4808446_forma__m29__otchet_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4808/4808745_skachat__kartu__spavna_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00051b36.bin
cf2ce7866579dcba120a8442e5ba8ac5a6f8eb82c4a199cd16e6decde1e76b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B36 8796 bytes
font_01_sfnt_off0005339a.bin
cd185fecf30b23ccf9806bfebd2c3f734d54d081b6af517e973aadf6a20a1287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5339A 15176 bytes

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