Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a8ac68d23c105c…

MALICIOUS

PDF

46.2 KB Created: 2021-06-07 05:16:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed4556596239d560c89090dcb93c3d77 SHA-1: 7a590b37dbb04b87b0482626e473b0f2c9ec0ff1 SHA-256: 02a8ac68d23c105c2e11eacc6723c712a0767046c342f4db065c8032804656d5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple invisible links that redirect to CAPTCHA-themed lures, specifically related to 'Robux' and 'game hacks'. The ML classifier strongly indicated maliciousness. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/can-you-charge-robux-if-you-are-free-user-game-hack
    • http://library.stembi.ac.id/repository/robux-hack-tools_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdf
    • http://library.stembi.ac.id/repository/free-100-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/download-tiktok-for-free_GM835599320.pdf
    • http://library.stembi.ac.id/repository/roblox-robux-hack_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://library.stembi.ac.id/repository/lazyblox-com-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-tiktok-followers-app_GM835599320.pdf
    • http://library.stembi.ac.id/repository/minecraft-free-download-pc_GM479516143.pdf
    • http://library.stembi.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-in-roblox-without-recaptcha_GM431946152.pdf
    • http://library.stembi.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • http://library.stembi.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/get-free-tiktok-likes_GM835599320.pdf
    • http://library.stembi.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://library.stembi.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052da.bin
b72bb7c1994651a4a78728a1ade27926b74381f84c87c4e0fa1f0344b980c73e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DA 26536 bytes
font_01_sfnt_off00008fda.bin
516db46bb807bbfc229e8bdf68e35073589bef77a2e18444eb8ccfaf7610cbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDA 19044 bytes

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