Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c54d77a597ed77d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 08:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 564ef10aacb4d3c709a23d2faeafcbc3 SHA-1: 16d184ea313d5432d3bd69faa294023a71eedc7f SHA-256: 8c54d77a597ed77d2cdaceab76476cdd8426d83bd38680682daffd6adcc32ad2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-hack-spins-app-game-hack PDF link annotation
    • http://lc.pustaka.unand.ac.id/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AE 22244 bytes
SHA-256: 774737db0267a4d3622e5803299b3913087aecbc14a28bfb78a54e3ae0b7df25
font_01_sfnt_off000061de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 18180 bytes
SHA-256: 1e953b72540ec4677b5f3a09436cf02581c7252e246dbe5ac414cafa51ba2d5d

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