Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d9809c209e502a…

MALICIOUS

PDF

183.8 KB Created: 2015-07-24 13:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.2.1 (via Qt 4.8.6)
MD5: b2a497f8d94804d1ecdf8a399941be76 SHA-1: 849c372c3491e50ee05659f6b1ac27be68c1b230 SHA-256: 21d9809c209e502a978c37d44b2eb3d3c2a9952f9068cd852bbcdd394a9cade1
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 link, http://botcraftman.ru/?lip&keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+windows+7+64+%D1%82%D0%BE%D1%80%D1%80%D0%B5%D0%BD%D1%82&charset=utf-8, likely leads to a site distributing malware or engaging in phishing. The ML classifier also flagged this PDF with high confidence.

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.
  • 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=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+windows+7+64+%D1%82%D0%BE%D1%80%D1%80%D0%B5%D0%BD%D1%82&charset=utf-8
    • http://fastpic.ru/
    • http://www.liveinternet.ru/click
    • http://img0.liveinternet.ru/images/attach/c/5//4192/4192077_biletuy_pdd_na_android.pdf
    • http://img1.liveinternet.ru/images/attach/c/5//4191/4191977_53_30.pdf
    • http://img0.liveinternet.ru/images/attach/c/5//4192/4192347_proverit_balans_kartochki_belinvestbank_cherez_internet.pdf

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_048_off0002a16f.bin
73e2dbc3eae59a92135750e699fb2c41d77b3f1d58336a63e60ed7615c068b3b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A16F 6884 bytes
font_00_sfnt_off00023b2e.bin
880e53e6f12106514012eaabb19a261b9f8ae03d695445fc59a5b9b5a1293281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23B2E 3556 bytes
font_01_sfnt_off000248b1.bin
3b0b042d4b06651a4b8a6be223c4740943445f24df2395f5c50c0ba49e59055d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x248B1 14532 bytes
font_02_sfnt_off0002764c.bin
7f40230875304c427e6f74bdc81b9869897cb7d4bcff4d0271a505d3322118ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2764C 14584 bytes
font_04_sfnt_off0002b560.bin
819f9cc5156bfe3dae03045446d677a19b5879270357875344f9514601da73e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B560 6084 bytes
font_05_sfnt_off0002c4f5.bin
9364d8c42993f0db1eb41a63b15a48dd56cef5056a611ab8e91dd81183a5a95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4F5 3752 bytes

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