Malicious PDF — malware analysis report

Static analysis result for SHA-256 966feffb1b1b9b20…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 12:23:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e61d19bb6b494b89b3390deff8dae968 SHA-1: 7eeb059408f0b5e15d0ece9df8ec3d06ca704d55 SHA-256: 966feffb1b1b9b2024f61d67d49fcb7b5c1f448925b2df9407a209a951247d67
160 Risk Score

Malware Insights

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

The PDF document contains lures related to game hacking and redirects users to a known malicious redirector infrastructure. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to lead the user to potentially harmful content or further stages of an attack. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or redirection attack.

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/431946152/how-to-hack-in-roblox-prison-life-game-hack In PDF document text
    • https://cosmosocean.com.tw/upload/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/people-on-roblox-who-give-free-things_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-games-on-xbox-one_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/hack-para-tener-robux-en-el-movil_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-accesoirs_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-roblox-and-fly_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/cheat-codes-for-roblox-on-phone_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336B 21952 bytes
SHA-256: aa212545a5e0f9c112cb18e3305a270e87f39158651455d441c9203590b9910d
font_01_sfnt_off000063b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 19092 bytes
SHA-256: a35ded4b1533c5edb4693f0e9c1cbeeca8a6631724cd2872fdcfe7178e5551db

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