Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f8433dafab77a…

MALICIOUS

PDF

35.2 KB Created: 2021-06-29 03:13:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b5a4953cb3aa02a1843970b5a34f5ce5 SHA-1: c82a8eda9f1e91272dddc2b36c9b3d5eaed8f1cf SHA-256: 3a8f8433dafab77a2d7b184e88a5653c74d1eb895201d1d6adeb951878d83c62
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a primary focus on luring users with promises of free Robux and game hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a redirection to a potentially harmful site. No scripts were extracted, but the document's content and heuristics indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/5-roblox-games-that-give-free-robux-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-hoodie-template_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/change-the-amount-of-anything-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-human-verification-2021-pc_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robux-tool-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/como-conseguir-robux-gratis-2021-real-sin-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-a-free-face-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/volar-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cheats-online_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robuxhackjs_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/games-on-roblox-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-other-pples-stuff-on-roblox-mm2_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
stream_002_off00003031.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3031 22660 bytes
SHA-256: 29f529a2d43d4d6363165b81237ef5ffdafcffe25f990aa3b4d7daa086899fa0
font_01_sfnt_off000062d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 19688 bytes
SHA-256: 06de28f29a1f90acf774587631399a30f58e99c2f7f7943cec0bacd097a8ba51

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