Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cf894fb51ca767…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 18:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 156cbdcbf01ba7f5c328ac2f7b791eae SHA-1: 85870c06435e8e4f65e34efd1a4bcc13e59714a6 SHA-256: 21cf894fb51ca76792d49f82081a0b14b433323bd3985c24de22aa3f5b415e43
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, disguised as a lure for free game currency. The primary URL, https://netcdn.xyz/app/406889139/free-spins-and-coins-on-coin-master-game-hack, is part of a campaign to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

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-and-coins-on-coin-master-game-hack In PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://xn----ttbgfkcjc5fd.xn--p1ai/images/free-promo-codes-for-coin-master_GM406889139.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
stream_003_off00004af7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF7 24724 bytes
SHA-256: 1a3fea20e5f0499fb5d47e6b3443568c123365c144e34665a1a5d0808d432471
font_01_sfnt_off000082c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C8 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa

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