Malicious PDF — malware analysis report

Static analysis result for SHA-256 216c8cb131fd944e…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 06:44:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7cd6e72c90b42c1059d53b4c545e3eb7 SHA-1: 10265fb53f1ba778036e4e1f34c7bef415dfea34 SHA-256: 216c8cb131fd944ebe60f77105307e4df212d91abf0453ce0b38a13720451d24
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/free-roblox-groups-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-tiktok-followers-in-5-minutes_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/tiktok-free-download-windows-7_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E41 27716 bytes
SHA-256: 5000149e033daec085151a1f7d74860f17c7b6183e8a56dcd0201ba8a3c3d71e
font_01_sfnt_off00008dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC1 18264 bytes
SHA-256: 59dbfb19f503ab5ccde5afb48b0ebb207c820587c290c946a9c33262b394e3ff

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