Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca15ce04f59f2516…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 00:32:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 82d47c6d6299b69b7f0e1a8e1b506417 SHA-1: 0e8f48ce19c704d92c5823ba291a7bc32e183621 SHA-256: ca15ce04f59f2516acec7567e0769a47c0bd75fa00ca8fb391dc7e0c0006df69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents itself as a lure for free spins in the game Coin Master, directing users to download a file from a suspicious URL. The ML classifier strongly flagged this PDF as malicious, and it contains multiple embedded URLs pointing to similar game-related cheats and hacks. The presence of these lures and the high ML score indicate a phishing or malware distribution attempt.

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/coin-master-daily-free-spins-link-download-game-hack In PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-use-no-clip-hacks-roblox-2021-novenmber_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-generator-no-installing-apps_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-adopt-me_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/beast-mode-face-roblox-free_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/red-boy-v2-jailbreak-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/kazok-free-robux-game_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-get-free-roblox-for-real_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
stream_002_off000030a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A2 22736 bytes
SHA-256: 185826663d72ce744c382b2b65545c7ed680da6fead41af4bd6ffe4de20fa4a4
font_01_sfnt_off0000637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 19104 bytes
SHA-256: 1b3ac101fdb2fbdd1773afcfea5d38c0f5f673fc95d2b0bc1f999aec93343208

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