Malicious PDF — malware analysis report

Static analysis result for SHA-256 8937c2718f96b6ed…

MALICIOUS

PDF

43.4 KB Created: 2021-05-17 14:57:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b3ffe28279f1d6231a44c86f7d117bea SHA-1: b0760f2ea6e25d03f7c6b1e1572c9f0fb0e28963 SHA-256: 8937c2718f96b6eda139d7f0fb007cb88b64966338e783f531017ce63f856b69
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a PDF link farm, suggesting a tactic to manipulate search engine results or direct users to potentially malicious sites. The presence of a call-to-action phrase and the ML classifier's high confidence score further support a malicious intent. The primary goal appears to be driving traffic to these external resources, likely for SEO spam or to facilitate the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/406889139/coin-master-free-coins-link-2021-today-game-hack
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-spin-generator-tool_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-spins-coin-master-april-2021_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/ro-ghoul-script_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/get-free-robux-info_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-link-today_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-on-phone_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/robuxy-com-generator_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-free-robux_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/daily-free-spins_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-online-free-no-download_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/haktuts-coin-master-free-spin-today_GM406889139.pdf
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-co_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc6.bin
1c67ba0fbc6c1f3550232b531ced40f705c45ff11af79fb7009d4d1efbdcfbcd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC6 25956 bytes
font_01_sfnt_off00008624.bin
54ee628be55815102d4fd2b2c16d0cf2d83f73b68c782c007c481b291bfa8535
pdf-font-stream PDF embedded font (sfnt) at offset 0x8624 18636 bytes