Malicious PDF — malware analysis report

Static analysis result for SHA-256 f305f88daf3ada6d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 16:36:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 74525d06031cbdc477a99183121888b8 SHA-1: 26d353cf26ef71b503d60a42fd0214003344d17a SHA-256: f305f88daf3ada6dd4e97cf2e2e6f73ede0d7ed602df7420f9d92e965b197ee5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including one pointing to 'netcdn.tw/app/431946152/free-old-roblox-accounts-game-hack', suggesting a lure for downloading potentially unwanted or malicious software. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of numerous links related to game hacks and free items indicates a phishing or scam attempt, likely intended to trick users into downloading a second-stage payload.

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.tw/app/431946152/free-old-roblox-accounts-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cheats-codes-roblox-treasure-hunt-simulator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-a-t-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-builders-club-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/fire-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/nuevo-hack-de-robux-2021-funcionando_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-shavaka-roblox-id_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-hair-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-games-nice-and-quickly_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-key_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-on-a-tablet_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacking-code-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-scripts-free_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_off00003190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3190 23116 bytes
SHA-256: 0bf588b7a8279c65cd7a3e1b42af87f9b8e8b69f9ad9eca0514047b3ee6bb546
font_01_sfnt_off0000652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 19068 bytes
SHA-256: 503a1698c153e34e51ab91e003e1c8708ab9c578e834d8d147ea019b45b7297e

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