Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b259eaf57abfad7…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 05:22:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d2838f203037ed05eba632fde9d5b00f SHA-1: 0ac5254da95c9ab8c715023dc21aaa5ca0ccbe9f SHA-256: 4b259eaf57abfad7d491f34a05b5f4e9e03430ece0939e1daf08ed5072fa4388
162 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it links to a 'free generator / game hack' lure, which is a common tactic to trick users into downloading malware. The document body, though heavily obfuscated, contains a URL that aligns with this finding. The presence of a fake CAPTCHA heuristic further supports the malicious intent of tricking the user into executing further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/aircraze-roblox-hack-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/robux-hack-download-pc-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-form-farms_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-promo-codes-2021-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-roblox-forums_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hacked-version-download-apk_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-report-cheater_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-really-works-easy_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-obby-no-password-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-make-time-freeze-in-roblox-free-admin-hangouts_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-bypass-key-systems-on-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-hacks-net_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/demogorgon-roblox-free-body_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-cheat-in-roblox-find-the-doges_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hacks-for-roblox-on-phone_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-robux-hack-console_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-a-free-pet-in-adopt-me-roblox_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
stream_004_off000050a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A7 26372 bytes
SHA-256: a96bd7f5fa496fbc54d1439aa49457fcd5d189f09412fe3570ff6e3381ac8ac2
font_01_sfnt_off00008dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBD 18384 bytes
SHA-256: 56b3bf30b5d2b186af830bd71d61390737752014018b98c23748128599983d41

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