Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f1d11b1a46115e…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 20:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ac65dd8978a09fa15fab9b5349f88cd7 SHA-1: be2733cab629c63ad2eb49a9a55cb47582089323 SHA-256: 66f1d11b1a46115e5971099deab856c01d9b35b2ea18ecddfe34989f479ac156
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures for popular games. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-ios-game-hack. The document body and embedded URLs suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the presence of multiple malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-spins-ios-game-hack In PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A8 25144 bytes
SHA-256: 90e9861494832aab8cc7b41fb97535d5e22d7765dc13cbb43c0f2ebec6b6a98e
font_01_sfnt_off000083a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A1 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8B 17884 bytes
SHA-256: ed32a7283540f03019957517c048a41e05a4a835eff26d475850fba8ab898570

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