Malicious PDF — malware analysis report

Static analysis result for SHA-256 5601d7ef3d52607b…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 05:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 167333c9b30c378f763bf188f2e455cc SHA-1: c5b24f0a0e8494e2b627ea0685f8f892a1703ee0 SHA-256: 5601d7ef3d52607b5d94c00200a96fe7ab1c2b087a38d97e589c64349cf8eace
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into downloading a secondary payload from the embedded URL. The document body and extracted URLs suggest a theme of game-related hacks or cheats, which is a common lure for distributing malware. The ML classifier also flagged this PDF as malicious.

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.tw/app/431946152/hack-for-robux-2021-game-hack PDF link annotation
    • http://www.digilib.uim.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-admin-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-jailbreak-free-money_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-all-gamepasses-for-free-script_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000510a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x510A 25748 bytes
SHA-256: 36eb6219d8fc6875051605ea9b3805887b70fae196698e4fd3843a0920350e60
font_01_sfnt_off00008bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEF 18816 bytes
SHA-256: 1962b9c9795e1733cc6a8b6ed8d8e1c791e7af410e2202646f60ba1693ded620

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