Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb29df996d7a87f1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-07 10:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3e4619d8316bfb9b2972449176735e8a SHA-1: 6661abdd14132a0d076e5b017f5e85f8a17577bf SHA-256: bb29df996d7a87f17be20f95f9c4a86a7cf4376f7d1780259e318adc456efbc8
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 0.9980

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/how-to-use-scripts-in-roblox-hack-game-hack PDF link annotation
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/honest-robux-hack-may-2021_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-roblox-heads_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-free-items-glitch-2021_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/desc-this-obby-will-get-you-free-robux-without-password_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-cbro-aimbot-hack_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-roblox-com-accounts_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-welcome-to-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-glitch-codes_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_off00003166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3166 21292 bytes
SHA-256: 05f9f94b72f93f49b665f701861c6b1f7a1f3972636403b0fab25e1cffe81452
font_01_sfnt_off00005fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB4 19220 bytes
SHA-256: a8bf9d06374e0db8ffccbebc60cb81def042f511a0a1c8beab4e32725b7b3d1b

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