Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c62b48cd268e99…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 09:00:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fb8e3f2a89d3fc2da8954fa2a685a147 SHA-1: be48209b0c55fe2aa34a811f741759c2dca1d4af SHA-256: 47c62b48cd268e9988efc637baa8abab64b50339a07e4afb3c4c0ed632fe0860
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or scam operation. The presence of a fake CAPTCHA heuristic indicates an attempt to trick the user into performing an action, likely to download further malware or engage with a fraudulent service. The ML classifier strongly flagged this PDF as malicious.

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-free-coins-and-spins-today-game-hack
    • http://gops.pruszczgdanski.pl/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/minecraft-svg-images-free_GM479516143.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/100-free-coin-master-spins_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/coin-master-free-spins-link-no-verification_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/free-robux-link_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/earnrobux_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/minecraft-114-4-download_GM479516143.pdf
    • http://gops.pruszczgdanski.pl/images/www-rbxhut-com_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/roblox-verification_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/how-do-u-hack-roblox_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • http://gops.pruszczgdanski.pl/images/where-to-get-robux_GM431946152.pdf
    • http://gops.pruszczgdanski.pl/images/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c5.bin
93541a6291790bbae3b3927bad4784fdf2637f6d3bf93550f13da06f6459d19b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C5 24380 bytes
font_01_sfnt_off000081e1.bin
4e9460ee7c922f2330eb91d2df2ab210a384988491c8b06196f83513902e5b38
pdf-font-stream PDF embedded font (sfnt) at offset 0x81E1 18240 bytes