Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ec5d6b75e2464c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 04:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6e04d68eba0ef2c5a347d7f6f99fc71e SHA-1: 821bb48f7ded16a5a90ebf786bfd0fc24b9d65a6 SHA-256: 76ec5d6b75e2464c1a3e6f8c4aee4e28ca1da90084ace36de7d4832bc65da712
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document employs a fake CAPTCHA and game hack lure to trick users into executing a command, as indicated by the 'SE_FAKE_CAPTCHA_CLICKFIX' and 'SE_LOLBIN_RUN_COMMAND' heuristics. The embedded URL and the presence of a command-like string 'cmd_GM431946152.pdf' suggest the document is designed to facilitate the download and execution of a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://netcdn.tw/app/431946152/roblox-speed-hack-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/free-robux-with-inspect-element_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/pokemon-go-free-644_GM1094591345.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robux-hack-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-theme-park-tycoon-2-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-robux-hack-november-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-cheap_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-roblox-hack-swirl-candy-girl_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-using-cmd_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-2021-app_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-executor-download-free_GM431946152.pdfIn macro / runtime command snippet
    • http://lib.smklabor.sch.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/frIn macro / runtime command snippet
    • 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_off00002f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F19 22156 bytes
SHA-256: b3904b04ccd9fb8f2aa90e185a0d387dc42aa30454b9cd51b37b699f772202a5
font_01_sfnt_off00006064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 19008 bytes
SHA-256: 0d35cfadd0fca3b252b73fcf83046c0556c80fc1b3ae89449d52291489f63b0a

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