Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90ca87fdb00eb45…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 07:38:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4b1a8af110360fb0685734029fa620fd SHA-1: a91f686df130060ab0c38156fa47519d7d4762f2 SHA-256: e90ca87fdb00eb4531d6c532303cb17f8d30f17cf4d8fe89f22c1f30ba48a9b2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL and numerous other URLs point to sites offering game-related hacks, suggesting a lure for potentially malicious downloads. While no scripts were directly extracted, the PDF structure and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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/431946152/but-link-says-free-robux-game-hack
    • http://solidkom.ch/images/roblox-free-robux-hack_GM431946152.pdf
    • http://solidkom.ch/images/game-toolbox_GM479516143.pdf
    • http://solidkom.ch/images/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://solidkom.ch/images/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://solidkom.ch/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-download-hack-ios_GM406889139.pdf
    • http://solidkom.ch/images/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://solidkom.ch/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • http://solidkom.ch/images/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-real-hack_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-hack-2021_GM406889139.pdf
    • http://solidkom.ch/images/free-download-coin-master_GM406889139.pdf
    • http://solidkom.ch/images/how-to-win-robux_GM431946152.pdf
    • http://solidkom.ch/images/coin-master-free-link_GM406889139.pdf
    • http://solidkom.ch/images/minecraft-free-download-windows_GM479516143.pdf
    • http://solidkom.ch/images/how-do-i-earn-robux_GM431946152.pdf
    • http://solidkom.ch/images/roblox-toy-codes-free_GM431946152.pdf
    • http://solidkom.ch/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://solidkom.ch/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000479b.bin
c87555e8e6c8e0939c9b3c0ccd2ed668df9e032ea88bb42cf732b2e204294785		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479B 24908 bytes
font_01_sfnt_off00008119.bin
8fbe90bccae9ee3155d3d967e7829d2e05c9e53767c9dd01fe36dc6e4248615b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8119 18816 bytes

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