Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21ab36a21ceac0…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 11:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e5c06962e998fdc7dd8a81ca055187c4 SHA-1: da42e5bf0ca2d2d665e5a64b815bc11fc773c45b SHA-256: ef21ab36a21ceac0a652c0b928f3cc0891ceff859111b1cb9e464bb958b89ea6
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into interacting with it, likely to initiate a download. The embedded URL points to a resource related to 'free robux game hack', suggesting a scam or malware distribution. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/ways-to-get-free-robux-game-hack
    • http://perpustakaan-stikesmsb.com/repository/free-spins-for-coin-master-that-work_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/minecraft-pe-free-download_GM479516143.pdf
    • http://perpustakaan-stikesmsb.com/repository/fast-robux-online_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/blogspot-coin-master_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/minecraft-fly-hack_GM479516143.pdf
    • http://perpustakaan-stikesmsb.com/repository/get-robux-today_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/free-account-roblox-2021_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-time-speed-hack_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-without-verification-ios_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/master-coin-master-free-spin_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/free-roblox-shirt-templates-2021_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/apk-coin-master-hack_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/roblox-robux_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-hair-on-roblox_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/twitter-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ec4.bin
7fe9f22869afc9ee0549846bc50ff2bb1919703b25beda721c219800e7a5a412		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC4 24980 bytes
font_01_sfnt_off00008882.bin
b2cd5ec598a8c260812e966e9710fb38f03066217a6d0ec8f431d8a9dca8af42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 18724 bytes

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