Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a3b75e1d43c688…

MALICIOUS

PDF

185.7 KB Created: 2015-07-24 08:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.2.1 (via Qt 4.8.6)
MD5: c843fce692c74eaa0edb5578d1a4b704 SHA-1: 1bbdebab3e229c4c1bcf2b1a13cde98144a2033e SHA-256: b1a3b75e1d43c688bbef8a85d377c792b7b56b4216a8a886d5497afc303ad949
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to botcraftman.ru, which is flagged by multiple heuristics as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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-8789008-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8789008-0
  • 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=%D0%BA%D0%B0%D0%BF%D1%83%D0%BA%D0%B8+%D0%BA%D0%B0%D0%BD%D1%83%D0%BA%D0%B8+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B2%D1%81%D0%B5+%D1%81%D0%B5%D1%80%D0%B8%D0%B8+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE&charset=utf-8
    • http://fastpic.ru/
    • http://www.liveinternet.ru/click
    • http://img0.liveinternet.ru/images/attach/c/5//4186/4186748_zakruytaya_shkola_5_sezon_skachat_torrent.pdf
    • http://img0.liveinternet.ru/images/attach/c/5//4184/4184545_realnuye_kimuy_egye_po_matematike_2015_5_iyunya.pdf
    • http://img0.liveinternet.ru/images/attach/c/5//4184/4184870_igruy_dlya_yelektronnoy_knigi_prology_skachat_besplatno.pdf

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024219.bin
880e53e6f12106514012eaabb19a261b9f8ae03d695445fc59a5b9b5a1293281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24219 3556 bytes
font_01_sfnt_off00024f9c.bin
cfbac71fd550521c45380819f8859bf79ca01986e4189927fa4896caaa8742f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24F9C 15096 bytes
font_02_sfnt_off00027ee3.bin
c33e6903d76079777c1b082a355654bfa5653b97afd40bc3e5344b34556d24bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27EE3 14468 bytes
font_03_sfnt_off0002a995.bin
4b3e00d4303044d83cea3db8c1ea2df145c3249d58852c36b06bf0794c18916a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A995 6748 bytes
font_04_sfnt_off0002bcef.bin
819f9cc5156bfe3dae03045446d677a19b5879270357875344f9514601da73e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCEF 6084 bytes
font_05_sfnt_off0002cc84.bin
9364d8c42993f0db1eb41a63b15a48dd56cef5056a611ab8e91dd81183a5a95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC84 3752 bytes

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