Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfedc139a0277c0…

MALICIOUS

PDF

34.9 KB Created: 2021-06-30 08:45:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 64d32da2aeaa203089fa9fd8cbff61c7 SHA-1: bf43d6039e447e0a5d2e53bd95eb95de5ea95566 SHA-256: 3dfedc139a0277c07b0eff139b1cee0c6c234fcb046c7e111b2cb3d8c310ea85
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on academic-looking domains but appear to be part of a link farm. The primary lure is 'free robux' and 'game hacks', suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the PDF structure points to a link farm designed to redirect users to potentially malicious content or generate ad revenue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/www-pastebin-com-free-robux-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/free-robux-codes-new_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/download-hacked-games-com-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/forts-update-the-northern-frontier-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/draw-free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/telecharger-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-accounts-with-robux-v3rmillion_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-be-a-vip-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-how-to-get-free-robux-obby_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-players-on-ipad_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_off0000306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306C 22168 bytes
SHA-256: 51e69187f9036a4f0f15b576b6b3b26dcb5c226e5bcfb1ab816b4f729858f849
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 19716 bytes
SHA-256: d50bf2547ef15543208c9374b77eb81ac5c29e994ca72ab11e76312558dd1a4a

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