Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a82509ac9e8125…

MALICIOUS

PDF

347.2 KB Created: 2015-08-20 07:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 9e8709ed4b9ccd11ea915a66d39b7f70 SHA-1: bdd62034a5b714b3f548cf0b8e5137ed8eaf55ed SHA-256: c4a82509ac9e81256ee91ccbd4dacc1fba9b88ae9ae159d437d0c55390faaa91
98 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious URL, which is likely used to lure the user to a compromised site. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=Lge+android+net+mtp+device&charset=utf-8
    • http://img0.liveinternet.ru/images/attach/c/6//4638/4638804_yuniti_pleer_skachat_besplatno_dlya_kontra_siti.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4638/4638799_1s_8x_unipatch_exe_x64_skachat.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4638/4638791_mt65xx_preloader_skachat.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00051b42.bin
11efe3b842af77d442edea1ddd4f2bc9ed98105bb44b522c33e906c9057b7241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B42 10764 bytes
font_01_sfnt_off00053925.bin
930f5bd3c074c2b77d37b86a067d6c2937980bb2061b44a6d7d0520a40e18785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53925 17628 bytes

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