Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20c51237b33531…

MALICIOUS

PDF

374.0 KB Created: 2015-08-27 10:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: a4bc746834f07bae68b2550f542def4d SHA-1: 450bf596f686fd370c1d20d3a25f2a440d8d03c6 SHA-256: 9b20c51237b33531a1bc12a3680bd74f17a96ecdd2c3ea51bf19f989fe3ba7fe
90 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, http://botcraftman.ru/, which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure. The primary attack vector appears to be directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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%BA%D0%BD%D0%B8%D0%B3%D0%B0+%D1%82%D0%B0%D0%BC%D0%B0%D0%B4%D1%8B+%D1%81%D0%B0%D0%B9%D1%82&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/7//4772/4772456_belka__i__strelka_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4772/4772299_skachat__besplatno__programmu_.pdf
    • http://img0.liveinternet.ru/images/attach/c/7//4772/4772396_skachat__audioknigu__starik_.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00059513.bin
d120d0b841835867fe5a9b1cb082b2b9918757d7738a64f0adcc79e78d551e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59513 8664 bytes
font_01_sfnt_off0005ae1e.bin
a7b8fe6bcb7133e340e3978820e52c3ac49c2dd7a39b15077a2a84655deaa7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE1E 13976 bytes

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