Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f2bff53eceed82…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 17:14:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f1be27a7215d857ed7296bec3de9907 SHA-1: ab7d203a97d89a0f5bca1421041f04aa4361413d SHA-256: 91f2bff53eceed82ec5cb5bb25696838e71ecc925ed52decd430f86b5d71f294
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users into clicking a link. This link, 'https://netcdn.tw/app/431946152/free-robux-without-human-verification-2021-game-hack', likely leads to a malicious website designed to exploit the user or deliver a secondary payload. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-without-human-verification-2021-game-hack PDF link annotation
    • http://lc.pustaka.unand.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/cheats-for-royale-high-school-on-roblox_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-cash-in-bee-swarm-imulator-roblox_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-free-vip-t-shirt_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hack-gamepasses_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-without-human-verification-real_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_004_off00005016.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5016 24644 bytes
SHA-256: 61045488a118953358cae592942a2ca20ca13eaa487052411039e075cbbb2248
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 19624 bytes
SHA-256: 5c907f8fc0171ac382cbe47737dfe307495a07ea2f2097b2a41ed37680731fb3

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