Malicious PDF — malware analysis report

Static analysis result for SHA-256 c810a7e851565c5b…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 20:57:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b16a1df7beba52ab9567e5a153c1689 SHA-1: 6a96a8c81771aaf2db877d2dfa5f1f95cbcc175f SHA-256: c810a7e851565c5b8fdba3df9ad7e249d59014cc6aa532c3433eb0d9d730ef7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and further PDFs, masquerading as game hacks and generators. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a download button lure reinforces the phishing and redirection attack pattern. Although no scripts were explicitly extracted, the nature of the links suggests a potential for further payload delivery.

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/roblox-chat-hack-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/lohith-gaming-free-robux-6k_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/best-roblox-hack-sites_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-robar-cuentas-de-roblox-2021-akaka-pastebin_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-robux-codes-for-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-on-coin-master-hack_GM406889139.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_off00003111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3111 22892 bytes
SHA-256: a3335c0b8239e19ed6ee104372d39a899141221f3e16e114b05bf54391ff72da
font_01_sfnt_off000064a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 18928 bytes
SHA-256: aa86487c267d95393fe01c4b549d6af94f2c223ea4a8e618778eefb7c9ce1d97

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