Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3944c9c1ca1efa0…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 20:33:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a3422990d1c5934376fb3e3dcdb1ed3 SHA-1: d456aad99e590cd6a9cf7c9f17868565d2f290ef SHA-256: f3944c9c1ca1efa0fd83882ed610e4b5e597afad41f9b78c81743cf7b31bba27
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains multiple embedded URLs pointing to external sites, including one at 'netcdn.tw', which are likely designed to deliver further malicious payloads or lead to phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure techniques.

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/431946152/free-robux-groups-2021-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/roblox-jailbreak-hack-noclip_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-inspect-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-kick-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-buy-free-robux-using-inspect_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/tiktok-free-like-2021_GM835599320.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-bee-swarm-how-to-get-free-royal-jelly_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-funny-roblox-shirt_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/sign-up-for-roblox-for-free-safe_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-often-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-ios-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-roblox-counter-blox-2021_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_off00002e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E71 22460 bytes
SHA-256: 8b2f46d8a652f889e2907715b3e5fe0ab8ffb7ba07c0adb478c798b0ec9d400e
font_01_sfnt_off0000606b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 19296 bytes
SHA-256: b274ca6d2e3d14a2eaf0a8d8f251c670de139d2f59e1f69b73bb52ee948191dd

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