Malicious PDF — malware analysis report

Static analysis result for SHA-256 192499587712260d…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 03:06:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 957cde2423716cf7df4cb9e97bd8c0a7 SHA-1: e0fdda808897b0c208c601e2447f29dce546db2a SHA-256: 192499587712260d98e39d2b7ed38a26d6f2305188a9232797fd24e51dceb045
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a fake CAPTCHA lure, which is a common social engineering tactic to trick users into executing malicious actions. The document also embeds external URLs, such as 'https://netcdn.tw/app/431946152/roblox-how-to-get-a-shirt-for-free-with-bc-game-hack', which likely host the actual malware payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-how-to-get-a-shirt-for-free-with-bc-game-hack
    • http://library.stembi.ac.id/repository/roblox-games-with-free-boombox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-indieun_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-spin-in-coin-master_GM406889139.pdf
    • http://library.stembi.ac.id/repository/roblox-cheat-apk_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-minecraft-java-edition_GM479516143.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-on-samsung_GM431946152.pdf
    • http://library.stembi.ac.id/repository/como-hackear-la-cuenta-de-tu-amigo-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/coin-master-hack_GM406889139.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdf
    • http://library.stembi.ac.id/repository/minecraft-free-online-games_GM479516143.pdf
    • http://library.stembi.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-roblox-hack_GM431946152.pdf
    • http://library.stembi.ac.id/repository/black-magic-roblox-hack_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdf
    • http://library.stembi.ac.id/repository/coin-master-hack-activegamer_GM406889139.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-fans-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054b9.bin
459167d8fb6f3697a766fc8c930ff6d46d71afdf2ab066a918a56ef009f56f23		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B9 27288 bytes
font_01_sfnt_off0000922d.bin
c92d9eddfdd9a1c08bfc1e211de828b05f17ba007c1b7ab34c928667bc06418e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922D 18700 bytes

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