Malicious PDF — malware analysis report

Static analysis result for SHA-256 8873811c4fdff91a…

MALICIOUS

PDF

385.1 KB Created: 2015-08-19 16:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6)
MD5: 8d333876015bf572c6b296829567ea37 SHA-1: 59b9c8af6bb58fb2f4286d6ff266a7f87c3753ec SHA-256: 8873811c4fdff91ac25bf78532139d0b0ed69d306c34a333e51156aa606f3635
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B8%D0%B3%D1%80%D1%83+%D1%81%D0%BF%D0%B0%D0%BD%D1%87+%D0%B1%D0%BE%D0%B1+%D0%BD%D0%B0+%D0%BA%D0%BE%D0%BC%D0%BF%D1%8C%D1%8E%D1%82%D0%B5%D1%80+%D1%87%D0%B5%D1%80%D0%B5%D0%B7+%D1%82%D0%BE%D1%80%D1%80%D0%B5%D0%BD%D1%82+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE&charset=utf-8
    • http://img1.liveinternet.ru/images/attach/c/6//4627/4627694_priglashenie_na_devichnik_tekst.pdf
    • http://img1.liveinternet.ru/images/attach/c/6//4627/4627389_klyuchi_dlya_windows_7_maksimalnaya_sborka_7601.pdf
    • http://img0.liveinternet.ru/images/attach/c/6//4626/4626460_1st_studio_siberian_mouse_hd_127_min09.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005b2f4.bin
e0541e40aedca313b3be6f1a7dc9c71ac4e0181362c9430d231af6047a2bd58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2F4 9756 bytes
font_01_sfnt_off0005cedf.bin
71c1de0fcb020979ce9a5318bda5195ebddc87b844e0f5c3ba3bcc6890c68bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEDF 17528 bytes

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