Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f39f803f74cdfab…

MALICIOUS

PDF

50.9 KB Created: 2021-06-11 08:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0b6c8739e78c92637f13e9ce361db74a SHA-1: 0f63e0e209413519015f0b184c1e07f610e2b1b7 SHA-256: 5f39f803f74cdfab1d3f5c576678837cdd364366f595dd52fd5289c4803f9a03
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It also contains an embedded URI pointing to a URL that appears to be a lure for 'free Robux', a common theme in scams. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these elements suggests the document is designed to lead the user to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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-and-tickets-2021-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/free-robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/cheat-roblox-autocloc_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/script-hack-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-card-generator-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-cheat-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-dbfs-cheat-engine_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
font_00_sfnt_off000050ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AE 37892 bytes
SHA-256: 3b1cecfd787cd2fdec05ee1cf91368cc6484f6e04b8c442b72841cbd314295c1
font_01_sfnt_off0000a2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BF 18984 bytes
SHA-256: 4d78b034b7ee5ddbbf305b13839d7219e9f340b02049aded52bf4fb187bf1d59

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