Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b99427c61322b4…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 14:09:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c526a4e9a8151cb80a8319eda5c9c4d9 SHA-1: 3b78e99d3457f1447c0fe8e82b6fab76acdc6c00 SHA-256: c6b99427c61322b45dd19f7b2598b2855a56dffda3bf2e37d3d79a3faceeff6c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as "free game hacks" or "robux generators". The primary lure URL is https://netcdn.xyz/app/406889139/free-spins-coin-master-game-hack, which is flagged as a known malicious redirector. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-spins-coin-master-game-hack In PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://huizentekoop-andalusie.nl/images/robux-hack-2021_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_003_off000049ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EC 26948 bytes
SHA-256: 9b27d6bb3e2dfc967d704312ba05b75a48fd4922770966ce013f033d7f79fe65
font_01_sfnt_off00008715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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