Malicious PDF — malware analysis report

Static analysis result for SHA-256 840bde639d7ee4c2…

MALICIOUS

PDF

181.0 KB Created: 2015-08-08 13:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.2.1 (via Qt 4.8.6)
MD5: f1b5e75b815ca6f6c638ead1a6629ccf SHA-1: ce763c51c1b5a674fcc0ed7af2c5382b53352dd5 SHA-256: 840bde639d7ee4c222a13dfff9b68de7feb839ff13eaa6146b767d8acf3256c2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by a machine learning classifier and contained a link to known malicious redirector infrastructure. The embedded URL 'http://botcraftman.ru/?lip&keyword=gs+8300+%D1%81%D1%85%D0%B5%D0%BC%D0%B0&charset=utf-8' is the primary indicator of malicious intent. The document's structure and content suggest it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which may have been used to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=gs+8300+%D1%81%D1%85%D0%B5%D0%BC%D0%B0&charset=utf-8
    • http://fastpic.ru/
    • http://www.liveinternet.ru/click
    • http://img0.liveinternet.ru/images/attach/c/6//4388/4388601_hentay_igruy_na_android.pdf
    • http://img1.liveinternet.ru/images/attach/c/6//4389/4389824_coreldraw_x6_portable_skachat_torrent.pdf
    • http://img1.liveinternet.ru/images/attach/c/6//4389/4389937_ploschad_pravilnogo_treugolnika.pdf
    • http://www.microsoft.com/typography/fonts/You
    • http://www.microsoft.com/typography/fonts/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_048_off0002a032.bin
0314aef16f881b406b4ab7cd5bc4a0ea9580c09ef9364113fc296ec15d1e1bee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A032 6312 bytes
font_00_sfnt_off00023af2.bin
880e53e6f12106514012eaabb19a261b9f8ae03d695445fc59a5b9b5a1293281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23AF2 3556 bytes
font_01_sfnt_off00024875.bin
31858c1d06ccce20a5aaa0f86ab5e94a13e840d24cbb1676f4284a719b763b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24875 14248 bytes
font_02_sfnt_off000274ce.bin
5921dd081d142391a5d678634b737e1cc781f2b68d24edbd7e5cf934415a9271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x274CE 14684 bytes
font_04_sfnt_off0002b1fe.bin
819f9cc5156bfe3dae03045446d677a19b5879270357875344f9514601da73e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B1FE 6084 bytes
font_05_sfnt_off0002c193.bin
9364d8c42993f0db1eb41a63b15a48dd56cef5056a611ab8e91dd81183a5a95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C193 3752 bytes

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