Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79820d1d08c4c1…

MALICIOUS

PDF

45.7 KB Created: 2021-06-04 02:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 55cb19e87117e90b71a2c3798584f30f SHA-1: 014940d72642d090e9b95e4d52ab4426bb2da1b0 SHA-256: 1f79820d1d08c4c10393bf607805762aee546d74bc8bc1821a640d71d4b1dd27
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA lure, encouraging users to click a link to download a file. The embedded URL, https://netcdn.online/app/431946152/roblox-free-roblox-game-hack, likely leads to a malicious payload. The ML classifier also flagged this PDF with high confidence.

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.online/app/431946152/roblox-free-roblox-game-hack
    • http://perpus.wdh.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-for-iphone_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/free-promo-codes-roblox_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/roblox-verification_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/what-is-robux-in-roblox_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/free-robux-exe_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/free-spins-coin-master-app_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdf
    • http://perpus.wdh.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • http://perpus.wdh.ac.id//repository/blogger-coin-master-free-spins_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdf
    • http://perpus.wdh.ac.id//repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/coin-master-free-coins-today_GM406889139.pdf
    • http://perpus.wdh.ac.id//repository/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/master-coin-hack_GM406889139.pdf
    • http://perpus.wdh.ac.id//repository/coin-master-hacks-2021_GM406889139.pdf
    • http://perpus.wdh.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdf
    • http://perpus.wdh.ac.id/repository/coin-master-hack-version-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e42.bin
b18a1ace31177934bba4d69e57d0ce943edddb481aa39009b8a9ffcefcad0e26		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E42 30000 bytes
font_01_sfnt_off0000913a.bin
33938510eb20d060112d7682b9c88b880e5c2c8c33e748f0e85f3cc6be6c07ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913A 17948 bytes

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