Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d4758566824fb…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 08:16:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dc8953e07ce524f9f38d9f1564b1ff13 SHA-1: 0b874c2a82fe399a4cf1adf06fb5461ff387cd6f SHA-256: e81d4758566824fb6bdc33bec3193eec2dfdfb6791061ac3d1eec98cffd3f18f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with 'free Robux' or 'game hacks'. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms that the linked URL, https://netcdn.tw/app/431946152/how-to-get-free-robux-without-purchising-games-game-hack, is a redirector for such scams. While no scripts were explicitly extracted, the nature of the lure and the ML classification suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-without-purchising-games-game-hack PDF link annotation
    • http://digilib.akbidarrahma.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/tiktok-free-download-for-windows-10_GM835599320.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/pubg-uc-low-price_GM1330123889.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/doge-roblox-hat-free_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/how-to-get-everything-free-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akbidarrahma.ac.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.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_off000050c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C9 24840 bytes
SHA-256: 8a8db578190c0d1bc0662a638053803c4700ed77fb749efafa74596e229f6646
font_01_sfnt_off00008a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0D 19696 bytes
SHA-256: 7fc720427d14490a7c8f2dc407634bd69c0beabf41155b30ad827b662f7e4202

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