Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d7d129de331de9…

MALICIOUS

PDF

48.2 KB Created: 2021-06-10 17:38:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d493a78d4efbead5cffbb8a3b3fb68e8 SHA-1: b5fdd1f649e9c40222fc17ee9b2ee1f776302501 SHA-256: 42d7d129de331de9afb8ecc6329c238399c1f54cb221f719ac7a099b3b3ba05b
122 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick users into downloading a file, likely a game hack or cheat. It contains multiple embedded URLs pointing to similar lures, suggesting a phishing campaign. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/get-free-robux-download-game-hack
    • http://repository.ummy.ac.id/repository/como-ser-hacker-no-roblox-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-games-that-actually-work_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/get-free-spins-in-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/minecraft-pe-free_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/flip-master-coins-hack_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/pokemon-go-free-647_GM1094591345.pdf
    • http://repository.ummy.ac.id//repository/promo-codes-for-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-minecraft-generator_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/robux-hack-no-verification_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/how-to-get-robux-for-free-on-roblox-easy_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/free-minecraft-hacks_GM479516143.pdf
    • http://repository.ummy.ac.id/repository/how-to-get-free-stuff-on-roblox-2021-on-phone_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/robux-no-human-verification_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-unlimited-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-without-offers_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verification_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/60-free-spins-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005359.bin
bda0faba5c9b1846ab3ea8239241713861bb2325d616dcf0426c5e3942f3b0d7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5359 30024 bytes
font_01_sfnt_off00009831.bin
5db817da9089d61614b9b9e5645535b9ebb805c909c120f9c648c88857dbf8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9831 18924 bytes

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