Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fad40b71150bdc…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 19:33:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d5eb1055e09af7a544d9d30e03d5377f SHA-1: 1244a2ba6dd7c9cc77aaf839181d8d4a3131e60b SHA-256: c6fad40b71150bdc583dae045498429ba0389ded4f0ebabe57ca436b76721b72
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.tw/app/406889139/50-free-spins-coin-master-game-hack. This lure, combined with the document body containing similar game hack references and numerous embedded URLs, strongly suggests a social engineering tactic to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt.

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/406889139/50-free-spins-coin-master-game-hack PDF link annotation
    • http://akbidprimahusada.ac.id/elibrary//repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/cheat-codes-roblox-reason-to-die-101_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-gang_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/robine-roblox-hack_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/free-redeem-robux-codes_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/free-codes-for-shouting-simulator-roblox-list_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/hacking-money-in-vehicle-sim-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-speed-hack-in-roblox-simple-steps_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/in-which-country-pubg-uc-is-cheapest_GM1330123889.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/find-the-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/robloxcom-free-item_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/www-claim-gg-to-earn-free-robux_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_off000031c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C0 22356 bytes
SHA-256: 95d6ba4fbf53b0ce995fce98448f078be01da0798c056f1b263c64c1e78a427e
font_01_sfnt_off00006378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 18480 bytes
SHA-256: f050a5cb8527be99d3c3e84738d571a41e36df8bd1ad63ca537930e630161d23

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