Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b4b4feb4eefaa5…

MALICIOUS

PDF

34.1 KB Created: 2021-06-28 00:38:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f0c5058c63d73bb625555ef957537dc4 SHA-1: bb8928628ae5c574863736bd4dbf597f5db2ab0a SHA-256: 95b4b4feb4eefaa567161ab1f5c78528b08e4d0ca464d4d85b7b1ba9c374548d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and invisible links that lead to websites offering 'hacks' or 'free currency' for games like Roblox. The heuristic 'PDF_CAPTCHA_LINK_LURE' indicates these links are designed to trick users into completing CAPTCHAs, a common tactic to bypass bot detection and serve malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.co/app/431946152/robux-hack-no-survey-no-download-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-robux-hack-app_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-headphones-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pubg-uc-logo_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/assassin-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-noclip-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-accounts-with-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/xyz-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-money_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-para-dragon-ball-rage-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-acounts-roblox-site_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/i-am-now-crying-because-i-got-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-in-roblox-without-recaptcha_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/foro-hackers-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-hack-2021_GM479516143.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_off00002df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF7 21860 bytes
SHA-256: befa1b85106f70e0f1bb77e10392c17a427a690cf1d48a43cbe60503249c7510
font_01_sfnt_off00005e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 19596 bytes
SHA-256: 0b1124a01bf00f22d1c871c7e00a12fafa03ad6e2fa8bce87dc35b01964ab7f5

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