Malicious PDF — malware analysis report

Static analysis result for SHA-256 718481cb5992bf14…

MALICIOUS

PDF

43.3 KB Created: 2021-06-09 03:42:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f6d67ad45b9c3369c0e92508c408e6a SHA-1: f17056b1a122831cbefe9fcb69c3452009181a37 SHA-256: 718481cb5992bf145b3d131ce4cd9e714555fd9e81cc78728b7dde98e227c2f2
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link for free Robux, which is a common social engineering tactic. The embedded URL and numerous other URLs point to sites offering game exploits and hacks, suggesting a malicious intent to redirect users to potentially harmful content or download further malware. No scripts were extracted, but the ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-for-roblox-pc-game-hack
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/one-piece-millenium-roblox-hacki-book_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-da-hood-hack-download_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/best-free-roblox-exploits-2021_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hacked-roblox-spray-id_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-catalog-hack-script-pastebin-2021_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-apocalypse-rising-hack_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/obby-gives-you-free-200k-robux_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hack-dragon-ball-z-roblox_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hao-hack-roblox_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-immortal-hack-blood-of-iron_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/pin-robux-free_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/300-roblox-accounts-free-v3rm_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-color-name-hack-pastebin_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/how-to-recover-a-hacked-pin-in-roblox_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-clothes-for-roblox-and-no-survey-or-download_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/roblox-apk-free-robux_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-robux-2021-codes-withou_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/hack-tool-roblox-2021_GM431946152.pdf
    • http://elearning.mas.aljihad.sch.id/__statics/gudangsoal/files/free-roblox-hacks-like-jjsploits_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c9.bin
b8518cf97aae957f4c55f9ebfaea1474ee8f2e1c0ebca250b14a7ef1e1b34b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C9 23752 bytes
font_01_sfnt_off000086c2.bin
06b1bcb1d0d2b710e47b437e2f99a36fae86347040c479267e329c7bd70e3bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C2 18240 bytes

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