Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad87e9af9d76bb9…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 16:27:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 23b0c7359b3b7faa75544e529008cc93 SHA-1: 233a918fdf3dca708d3bee4f5e52c96b0f5b1b00 SHA-256: 5ad87e9af9d76bb97c1f38894059c0347b394e06b17c62e79ade1d89a98b47cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains multiple links, including a critical redirector URL, that likely lead to malicious infrastructure. The document body and heuristics indicate a phishing or scam attempt, likely to deliver further malware or collect credentials.

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/406889139/google-coin-master-free-spins-game-hack In PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-hack-tool-download-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-hack-peoples-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-glitch-site-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-online-games-like-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/hacks-para-dungeon-quest-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-hack-or-cheat_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-for-account_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-real-no-verification_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-camp-2-on-roblox_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_off00002fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA7 22436 bytes
SHA-256: 11e40be7ef1a8a8cda36206d275ae00bacf9f7294d309d22abfb441aa21cb11a
font_01_sfnt_off0000618f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 18248 bytes
SHA-256: 030bed7090460e4d71b0ce795308f81d11b161da8a2958b6b82163bc1faa59de

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