Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83b48ac85389bf5…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 00:49:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 62bd21c75292b0a2c01e7482ba81affe SHA-1: 64f1f3f73162c4963dd2f77c80934fd1efe5ef47 SHA-256: d83b48ac85389bf503590b1bea546087b67d7c180eca77fb2eb7d8893f3e8a09
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to the URL http://netcdn.tw/app/431946152/earn-free-robux-today-game-hack. This URL is associated with a high-severity heuristic indicating a game hack redirector. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs and the lure suggest a phishing or scam attempt.

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/earn-free-robux-today-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/boku-no-roblox-hack-script-auto-farm_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/cheat-stand-online-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-with-fake-credit-card_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/ingame-free-rubux-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/get-free-robux-denis_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/profile-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/nicsterv-how-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_off00002f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3D 21492 bytes
SHA-256: 52007f7fa190d2d0bcde901cdd51ad645195c6bdd8076050bd730f5b0e35e01a
font_01_sfnt_off00005e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 19072 bytes
SHA-256: 82db6ce193e18a75fae7aab420d9e740a3b7c910ba2cb20ee9d5d98feb1db9a0

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