Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9350f36cbb1f165…

MALICIOUS

PDF

44.6 KB Created: 2021-06-11 02:16:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b40b01c318c3b1fb0b16e876ec86182d SHA-1: abb565d5ab843e2643e82cb1ceca089db94383bf SHA-256: b9350f36cbb1f165fb096877c3426cb71a5ac453cc8d930e0fcb1c860ddf7cbe
122 Risk Score

Malware Insights

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

The PDF document uses a lure of 'free Robux' and 'game hacks' to trick users into clicking malicious links. It displays a fake CAPTCHA or human verification prompt, which is a common tactic to encourage user interaction and potential execution of further malicious content. The document contains numerous embedded URLs pointing to various 'hack' or 'generator' sites, increasing the likelihood of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • 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/how-to-get-free-robux-2021-no-verificationand-no-apps-game-hack PDF link annotation
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-free-accesoirs_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-robux-sites-that-work_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_off00004fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE3 24320 bytes
SHA-256: ae0e08c82ed8139aeb998c198646eb0bd5138c74bd6d95e30cd8f3f97a4aa237
font_01_sfnt_off000087a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A6 19516 bytes
SHA-256: c363fb7eda46feca059d0633a116a3d9fea812d1d7185fe6e74e661e3de38526

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