Malicious PDF — malware analysis report

Static analysis result for SHA-256 478b48f7cfc96d35…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 12:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-20
MD5: 2465cb28ef5b30a336142bcfcc64ccf5 SHA-1: e605f0d2cb54f94b9da6eaea730b920050365d10 SHA-256: 478b48f7cfc96d356414599cd6984dc6904afa1dd3fed28d7b539cd3f537404d
160 Risk Score

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/479516143/minecraft-for-free-apk-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-do-you-get-free-robux-2021_GM431946152.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
font_00_sfnt_off00004b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B04 24480 bytes
SHA-256: e04132e053a141da6b6921fddb13132bd8cf7f03627fd8ab591c0486286ea803
font_01_sfnt_off00008213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8213 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00008c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0F 18056 bytes
SHA-256: d47e60dea5201fd8468efb81a59f0775697a9902aff7ce548d06165675d44cc7

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