Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76adefb88bc6064…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 13:45:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ce3f6175fb13045d39c76fb65be48926 SHA-1: 41fcf9c0cb2aed34755ca594a56986bd26b1b189 SHA-256: f76adefb88bc60646aed4565e719dcdef263cf9aacb124cf87a55916d5d64c36
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to game-related cheat pages. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the document, likely to download further malicious content or visit phishing pages. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-fun-free-spins-game-hack PDF link annotation
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://promidiapropaganda.com.br/modules/default/fotos/uploads/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA0 23960 bytes
SHA-256: 0092a8bf7c74fe28e59c5af333eecddd85d6ddafe1f838d972765eff2f7187ff
font_01_sfnt_off000081db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 18028 bytes
SHA-256: b886d19e0857ddff44b85450f57c8c2707e7243da381be74ba2c44e7741ea293

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