Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5357d72593547b8…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 13:23:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4950eaf659d3411e671a6ea650f0da1e SHA-1: 92a8d17e2d590de09c85bdb7b97278bbec2173fc SHA-256: a5357d72593547b82c862ebada82ff357f49d95518ea99268c3267d24049da65
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and directs users to a malicious URL, http://netcdn.tw/app/431946152/free-robux-without-verify-game-hack. This URL is likely part of a scam or phishing attempt designed to trick users into downloading malware or revealing personal information. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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-without-verify-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/getbux-win-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/assassin-roblox-hack-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-how-to-buy-stuff-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/games-free-download-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/red-boy-v2-jailbreak-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/speed-run-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-obby-real_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-brother-cheating_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/newo-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-robux-download_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/get-free-robux-without-downloading-games_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-tell-if-roblox-hack-is-a-scam_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/cheat-engine-64-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/youtube-hack-de-juegos-apk-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-minecraft-account_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_off00002f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F53 22516 bytes
SHA-256: 3bd4b35fd7bfb1825a43a3d983772731947ffc6244f866fd401b334d92733ef0
font_01_sfnt_off00006191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 19620 bytes
SHA-256: 8aa86329d0795ab1cad193d913199e82be4c5431cadd1cc96f2f7af8a2f6b0e0

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