Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e76a3e72e3d08a…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 12:03:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5e27838c5b93707c00d75f1e2fd70f9c SHA-1: a4bb6e169b7352c3ee09d1544bb043f773b81598 SHA-256: 21e76a3e72e3d08ad5da7337a6b5f168b34d7dbc60ef7dbbc5cfed5bf414c784
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, with a primary URL pointing to a 'free Robux' generator hack. This indicates a social engineering lure designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in game cheats to deliver a payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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.tw/app/431946152/how-to-permanently-have-free-robux-with-inspect-element-2021-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/mad-city-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/cyber-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/www-roblox-hacks-and-cheats-com_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/serveur-discord-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-hack-builderman-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-gamepass-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-check-if-someone-in-roblox-is-hacking_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-200-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-copy-right-free-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/comment-faire-cheater-sur-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/codes-to-get-free-robux_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_off00002b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5F 21748 bytes
SHA-256: 867591431d65ec18d8eea17667ca7fb5736086611b6cee83d08fa596408f1cca
font_01_sfnt_off00005b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B39 20640 bytes
SHA-256: 2c6f0663f3d548a46158f4a4b6068399bb9d53997deafab9f48c0dafae84584a

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