Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cb2787b0555fe7…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 23:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e955b72c64600befb171878b3c5c9dd1 SHA-1: 46d530bca9078338a23881684e0d62e778e713ff SHA-256: 91cb2787b0555fe7f116a2498de1bd14371489235e5e5dfd387e1d4fca252ad6
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-free-spin-link-today-download-game-hack PDF link annotation
    • http://perpus.ftunismabekasi.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/code-cheat-roblox-to-chat_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/military-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/heists-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/breaking-free-roblox-piano_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-1k-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-super-easy-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-comment-hacker-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-hack-scripts-list_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-add-cheats-to-a-roblox-game_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/claim-free-spins-coin-master_GM406889139.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_off0000330a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330A 23276 bytes
SHA-256: 3f04ea0d04ae6fc0707e197e2dac39b3c23800a52e9347e1889b742fc81466ed
font_01_sfnt_off0000678c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 19104 bytes
SHA-256: 1895fc22eac210dcee8774f96ffcb0cbff56cbfdafdc0278c931d408205b68ac

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