Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7618a81f57d195d…

MALICIOUS

PDF

45.4 KB Created: 2021-05-17 03:38:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: adc9f3c3b11a1ae77d0bd9b6c31e8b1e SHA-1: baf3606ac4fa34b6d69bb200811969d49a16f02d SHA-256: e7618a81f57d195d9714894ec5428600565356cd2e1ebd0c0fad98de51db07ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, masquerading as "game hacks" or "free generators" to lure users. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-free-gift-link-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection workflow, likely intended to lead users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

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 https://netcdn.xyz/app/406889139/coin-master-free-gift-link-2021-game-hack In PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-spin-links-coin-master-2021_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
stream_003_off00004d13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D13 29800 bytes
SHA-256: a616fe42c513c103c5eda3db63d2d88007828641a0e39cb9fc530bf6e0ab948f
font_01_sfnt_off00008f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4F 18284 bytes
SHA-256: 00f588a17a5ec62cfb33c50734468f0ac7c021c7f981e3ddf1024eb2998eadd5

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