Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f6a3a5f3383103…

MALICIOUS

PDF

47.5 KB Created: 2021-05-13 01:24:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 06fe818485d05d4a0f25c78a4946f64e SHA-1: 35362af87fb463d9a3fea872a5a9a58e88dfcaf6 SHA-256: f4f6a3a5f338310338bd47eb3f0182abce8449d0dc27cc9b90328566aa70e919
82 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The document body and embedded URLs point to sites offering 'hacks' or 'free Robux', suggesting a scam or malware distribution attempt. The primary external URI, https://netcdn.xyz/app/431946152/robloxhacks-game-hack, is likely the payload delivery URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/robloxhacks-game-hack
    • https://esl.hess.com.tw/image/data/files/get-free-robux-no-verification_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-tool-v1-9-download_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/robux-offer-wall_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/minecraft-login-free_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/how-do-you-hack-minecraft_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/minecraft-free-download-chromebook_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/get-minecraft-windows-10-free_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-support_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/minecraft-hacks-wurst_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/robuxhub-net_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/free-roblox-pin-codes_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-for-ios_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-online-2021_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/easy-robux_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/download-coin-master-hack-mod-apk_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b51.bin
fa87ccf2e91f0d6611ede027f9fea74d4fcda3940618fbfd1e5acbbaf6609d89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B51 28684 bytes
font_01_sfnt_off00008d2a.bin
02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2A 2912 bytes
font_02_sfnt_off00009727.bin
4c82b5acf2344fb6074e769b7bb8f458d53ebd76102ce4f277dd7245c06f6447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9727 18348 bytes

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