Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61144a0511ed6b9…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 03:04:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bcdcd65a1b6d9c9e992478513842e333 SHA-1: 5d9534ba482b4799667318095b88fdd5e7d51249 SHA-256: b61144a0511ed6b92b5049ed433d2596080f1066488e0dbd706de1904f88e62c
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into downloading an application from the provided URL. The ML classifier strongly indicated maliciousness, and the presence of multiple URLs associated with game hacks further supports a malicious intent. No scripts were extracted, but the document's structure and embedded URLs point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-spin-hack-app-game-hack
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-box_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/google-how-do-you-get-robux_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-on-coin-master-game_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-without-offers_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-admin-hack_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-coin-master-app_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-time-hack-2021_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/cheat-codes-for-coin-master_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-rewards-2021_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/roblox-accounts-for-sale-free_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-cheats-2021_GM406889139.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-life-hacks_GM479516143.pdf
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-me_GM431946152.pdf
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c48.bin
0137c0a00835dcc26d58fbb1e28428bd8ee57eb1671329ea0cc2f5c107a65dc4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C48 25080 bytes
font_01_sfnt_off00008491.bin
f240daff11927ead54175dd0584966adfe4c567a63bac043ed3985d3f12dfc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8491 17892 bytes

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