Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a51affee98ca5fa…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 18:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 98c512f390f4de82912e2321fed7ad4a SHA-1: f46dd0ded56d8d0225a8e14a307d9aad6e6edca2 SHA-256: 9a51affee98ca5fa774cb06f28939b648af1f6734ea3885b4301ba2259f9760c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The ML classifier also flagged this PDF with high confidence. The embedded links and the nature of the lures suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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/is-roblox-free-on-nintendo-switch-game-hack In PDF document text
    • http://umksn.pl/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-creative-mode-free_GM479516143.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_off000045b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45B5 29164 bytes
SHA-256: f9463c869cb270beef63c1ed96737557116881a6eb7a1998b7e439df4fa76898
font_01_sfnt_off00008651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8651 18676 bytes
SHA-256: 0355fc141c5901985405d6ccc218732ea46d01f7e960bb3eb1147f2b88eb9437

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