Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ffa3faa4276d4a…

MALICIOUS

PDF

49.4 KB Created: 2021-06-11 10:20:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73f24e35ce08835dcb43387e9cd5a2ca SHA-1: 864fca300148c1a1d51ed25d45ce4d4983273acb SHA-256: 72ffa3faa4276d4a9a1d847d32279ac4973240ecc6d3a334095c42d37c6c73ce
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/fly-hack-exploit-roblox-game-hack PDF link annotation
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000557a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x557A 26156 bytes
SHA-256: 2e543d9133b1b508fe0267c4cac0e86b8746f4af19dbcda9ada60c69c48b1524
font_01_sfnt_off000092a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A1 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00009c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C47 18924 bytes
SHA-256: 66f16fd07b6daca034c00108488bfba1b3f0ce75b1df2d8f70713ea5e5fd7802

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