Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf9515130417f9f…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 21:39:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c9557f66587837b95b77f20958a9387 SHA-1: a9f52fa32c5240a297fc3f1ca879c1d26e94b41c SHA-256: ecf9515130417f9f313b3ff07cd2084ffdc800982ce07f5d51b3c92a81c396b4
82 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free Robux' and 'game hacks' to entice users. It contains multiple embedded URLs that redirect to external sites, such as http://netcdn.tw/app/431946152/free-robux-on-phone-game-hack, which are likely designed to distribute malware or phish for credentials. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure tactics.

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-on-phone-game-hack PDF link annotation
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-to-get-free-robux-by-just-clicking_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-exploit-free-2021_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/pastebin-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/hot-to-get-free-robux-2021-may_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-robux-obby-limited-time-only-games_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-cbro-hack-2021_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/hack-admin-roblox_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-robux-no-money_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/is-there-any-way-to-get-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
font_00_sfnt_off00003368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3368 22356 bytes
SHA-256: c477b32dd9e78906281cbf5a690488844839ad999b133deef799196243a9d5ff
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 19036 bytes
SHA-256: 3bc7039bf1a02ee44cf77d87306d68fb788e2fdb5082ebb4bdc7c743d7253944

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