Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670f125167a046a…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 06:55:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0cf689f5b62011657c28821f2b3d3538 SHA-1: 535f649c6f223b1c92d0d256e2498ebec8832f4d SHA-256: 6670f125167a046aa1036570b2461238d54c2eee2eeac4eacc5c793dda2da638
82 Risk Score

Malware Insights

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

The document presents itself as a 'Roblox Robux Hack' and displays a fake CAPTCHA to trick the user into clicking a malicious link. This link, found at https://netcdn.tw/app/431946152/roblox-robux-hack-without-offers-game-hack, likely leads to the download of a second-stage payload. The presence of multiple similar URLs hosted on compromised domains further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-robux-hack-without-offers-game-hack
    • http://perpustakaan.man2kotaserang.sch.id//repository/free-roblox-injector_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/moonactive-free-spins-link_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/roblox-group-free-robux_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-date-and-time-hack_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/robuxglobalcom_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/robux-boost_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-robux-codes-generator_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/minecraft-windows-10-hack-client-2021_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/free-free-robux_GM431946152.pdf
    • https://perpustakaan.man2kotaserang.sch.id/repository/minecraft-for-ipad-free_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hack-online-download_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-free-coins-link-2021-today_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/roblox-sued_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/roblox-generator-no-human-verification_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hack-mod-apk-android-1_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fef.bin
a66795d7b2053628c5d380aac630363a82b8190e9a114a86356a9ecbff591408		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEF 27180 bytes
font_01_sfnt_off00008d95.bin
eec79a8c7e77d6710ad164c2a34b0a0de8e7877ccb4774ddbd1e6d91e092d633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D95 18908 bytes

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