Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feea117fcf82e57…

MALICIOUS

PDF

51.5 KB Created: 2021-06-03 06:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: db3cd661f1574530ad707874e94f9d62 SHA-1: c8327a2a2ca08540599cdecf0889725744eba2db SHA-256: 8feea117fcf82e577559d7d63a294743e5bb5f56852eb236e04e1ab46ff25172
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.online/app/406889139/coin-master-coins-hack-game-hack, likely leads to a second-stage payload download. While no scripts were explicitly extracted, the PDF structure and heuristics suggest potential for embedded JavaScript or exploitation of PDF vulnerabilities to execute malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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/406889139/coin-master-coins-hack-game-hack
    • http://vetmed.fkh.unair.ac.id/repository/robux-hack-2021_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-that-actually-works_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://vetmed.fkh.unair.ac.id/repository/como-generar-coin-master-free-spins_GM406889139.pdf
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/free-minecraft-account-reddit_GM479516143.pdf
    • http://vetmed.fkh.unair.ac.id/repository/pubg-mobile-uc-xyz_GM1330123889.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hack-game_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/no-scam-free-robux_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdf
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/without-pokemon-go-free-promo-codes_GM1094591345.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-robux_GM431946152.pdf
    • http://vetmed.fkh.unair.ac.id/repository/minecraft-classic-free_GM479516143.pdf
    • http://www.vetmed.fkh.unair.ac.id/repository/free-tiktok-followers-instantly_GM835599320.pdf
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005193.bin
d234b8a389a9e083f6516b03848daf2a20a81b705785f6c683b2b157a5c697fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5193 31744 bytes
font_01_sfnt_off00009422.bin
e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9422 8676 bytes
font_02_sfnt_off0000a8ad.bin
c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AD 17716 bytes

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