Malicious PDF — malware analysis report

Static analysis result for SHA-256 53729bdf4a5bd4f7…

MALICIOUS

PDF

49.9 KB Created: 2021-05-17 04:01:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b96f5d8d43fd65e05759c6015c8f1425 SHA-1: 50b222d1f32c9cef62254acee2985cb7b8904f1a SHA-256: 53729bdf4a5bd4f7c6b7c1d08c6f9d2f18dce737657b399262e1de922ded49c1
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux, presenting a fake CAPTCHA to trick the user into clicking a malicious link. The primary malicious URL identified is https://netcdn.xyz/app/431946152/give-free-robux-game-hack, which likely leads to a further payload or phishing page. The document body and embedded URLs suggest a social engineering tactic to exploit users seeking in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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/give-free-robux-game-hack
    • http://windhorsetrek.com/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/free-coins-coin-master_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/cheats-for-coin-master_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://windhorsetrek.com/userfiles/files/robux-online_GM431946152.pdf
    • http://windhorsetrek.com/userfiles/files/link-coin-master_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-hacks-for-android_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-free-coins-link_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spin-today_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/minecraft-free-download-android_GM479516143.pdf
    • http://windhorsetrek.com/userfiles/files/coin-master-hacks-reddit_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • http://windhorsetrek.com/userfiles/files/get-2021-free-spins-on-coin-master_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/free-attacks-on-coin-master_GM406889139.pdf
    • http://windhorsetrek.com/userfiles/files/minecraft-logo-maker-free_GM479516143.pdf
    • http://windhorsetrek.com/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a91.bin
5b018d7a792c04e36bed192d5eb6bc79d9962f84733eb63ebc069413fca0d501		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A91 33552 bytes
font_01_sfnt_off00009414.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9414 5696 bytes
font_02_sfnt_off0000a126.bin
ea59f1cb8b041c2b832a039673c57edae81c360e33a5bea04888abdf43ec1c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA126 18248 bytes

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