Malicious PDF — malware analysis report

Static analysis result for SHA-256 9998d85721f19b5f…

MALICIOUS

PDF

34.3 KB Created: 2021-06-21 04:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 92dbd0cf869e1ced7c80bb9a000099cf SHA-1: d15a8dfca3b519a6e167cc29c345c00b61af34c5 SHA-256: 9998d85721f19b5fef8d9fd941e21f4ccbfd9f389661ede6db7adccfda858b29
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. The primary lure URL, http://netcdn.co/app/431946152/ok-google-how-do-you-get-free-robux-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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/ok-google-how-do-you-get-free-robux-game-hack In PDF document text
    • http://www.eucorro.com/arquivos/files/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/r-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spin-ml_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_off00002fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE5 21696 bytes
SHA-256: 8c7af0ca7eff1ab216b4c9ad2a48244b92ee804bfc6df2c2693484da3a1a30be
font_01_sfnt_off00005f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 19560 bytes
SHA-256: e4914d65789a197e954c6a36dfac9113f41bf4479b0c9c218b4dc30aeb9f845d

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