Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b53d210dfd62e0…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 17:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 732aa4df7314e8a16ae7f2c2ca5a4bb7 SHA-1: b8036ed62ac0a49a7053b01b6abd0417ad580cd1 SHA-256: 84b53d210dfd62e0ba01deb4f515de807f66159b2a22a6dc854bc7a4e187b8e0
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that are designed to lure users into clicking on them by promising free game hacks or currency. The primary URL, http://netcdn.tw/app/479516143/free-minecraft-games-for-kids-game-hack, is flagged as a redirector for game hacks. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions, and the ML classifier strongly indicates malicious intent. The document's purpose is to facilitate the download or redirection to malicious content.

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/479516143/free-minecraft-games-for-kids-game-hack PDF link annotation
    • http://lc.pustaka.unand.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-forumscom_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/unlimited-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/speed-city-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/youtube-roblox-hack-by-roexploits_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-roblox-servers_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-dungeon-quest-hacks_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-download-free-for-chromebook_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
font_00_sfnt_off000033a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33A3 22404 bytes
SHA-256: e985e63963c714c77fedabb92ffc359b931184a6414ff6a06a82c063947f255d
font_01_sfnt_off00006513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 18432 bytes
SHA-256: fce0cee9bb026e9b658c5a6be084441bf5d333caf380f9a351f6fa516673a190

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