Malicious PDF — malware analysis report

Static analysis result for SHA-256 539fd6f4bc5fa58e…

MALICIOUS

PDF

45.9 KB Created: 2021-05-18 01:42:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eab08650f77a7599f35ea8d33bf95ed9 SHA-1: 0081209ef9a4d2d728e31e92fd00085d721d6f6b SHA-256: 539fd6f4bc5fa58ea926f57b5fd96a128c027962ace5a4636cb4b3317bfcce6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free spins' to lure users. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-23-march-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/coin-master-free-spins-23-march-2021-game-hack In PDF document text
    • http://www.viniperfetti.com/images/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://www.viniperfetti.com/images/blox-rewards_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://www.viniperfetti.com/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.viniperfetti.com/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://www.viniperfetti.com/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://www.viniperfetti.com/images/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://www.viniperfetti.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.viniperfetti.com/images/how-to-hack-to-get-robux_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
stream_003_off00004999.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4999 25744 bytes
SHA-256: 1f0e3376067b4ad3c0a0e6ca0ca4c769c491fd74bcc9fbe9cf56182897e57ab9
font_01_sfnt_off00008513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF2 18628 bytes
SHA-256: ee10560f037836a310effba06f8e2a452031a98d457cdddaa4693c2fbbf13476

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