Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc33ed7ff4a55b7…

MALICIOUS

PDF

35.5 KB Created: 2021-06-19 19:35:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8533ee60876ce12f6c5fa88b59a84ffd SHA-1: f9aae353feee604c8c9e3eceb579dd7c08a67c80 SHA-256: 4bc33ed7ff4a55b79b922df031e80027e6d8cd9a0d10c86b0c93718ddfaa7674
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector infrastructure, masquerading as generators for in-game currency like Robux and Coin Master spins. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button lure further supports a malicious intent. The primary goal appears to be redirecting users to potentially harmful websites.

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/free-robux-web-page-game-hack In PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-free-play-no-sign-up-or-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/nuevo-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/roblox-project-lazarus-zombies-hack-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-generator-online-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/cheat-roblox-mad-city-money_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/2-player-cheat-pizza-tycoon-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-tapaktuan.go.id/repository/free-robux-only-1-step_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_off00003020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3020 23928 bytes
SHA-256: ad77faddcc91251f6c63a210c7987787202caa787be0f60ffef5d7f04addc6d7
font_01_sfnt_off00006596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 19068 bytes
SHA-256: e84f41f925d9a77c54a636d115dff57ebddb390033469e8b237015fcb48d74a3

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