Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821ec1fb5125f18…

MALICIOUS

PDF

43.7 KB Created: 2021-05-12 08:06:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e095a7dc63798b344da191f14822088b SHA-1: 78f33b3e50c1a18b589bdf59db51b1138c20f325 SHA-256: c821ec1fb5125f18059e1a6d2202dda966e1896e8686a5baf58234fc13be1035
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are flagged as malicious redirectors, specifically targeting users with lures for free game currency and hacks. The document body and embedded links strongly suggest a phishing or scam attempt to redirect users to potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-get-free-robux-generator-game-hack In PDF document text
    • https://rietenwinkel.nl/images/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://rietenwinkel.nl/images/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://rietenwinkel.nl/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/win-free-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/roblox-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://rietenwinkel.nl/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://rietenwinkel.nl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://rietenwinkel.nl/images/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://rietenwinkel.nl/images/minecraft-hack-client-18-9_GM479516143.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_off00004ad1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD1 27256 bytes
SHA-256: ef61ddb5824d367b27ecfa69dd6d6e0d5679a79a9f042d49333173a016b3b0fc
font_01_sfnt_off000087ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EA 18512 bytes
SHA-256: 02a745270f20da848e9c9bdefc0721d63769b74524dfc6c51231bae9bb0d5f7b

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