Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f8d966e9b7f831…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 15:07:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e10e19d726757517f159b6f17de29db SHA-1: 58d64a0accb8f007ef5b22d981e9d6297db490d9 SHA-256: 66f8d966e9b7f8311aadeb40aa3c8dc0a648bc21f0827ce520a596faa693ecb3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "game hacks" and "free generators" to lure users. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the lures suggest the document is designed to lead users to potentially malicious websites, likely for further exploitation or malware delivery.

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/coin-master-hack-2021-app-game-hack In PDF document text
    • http://optsuvenir.by/images/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/wurst-commands_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/grab-points-login_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://optsuvenir.by/images/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://optsuvenir.by/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://optsuvenir.by/images/100-free-spins-for-coin-master-2021_GM406889139.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_off000046f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F0 25016 bytes
SHA-256: d100f45c58f2e03e9b914ee6337407142395bf74acaaa8646bc651e47920e549
font_01_sfnt_off00008028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 18296 bytes
SHA-256: 0171898879de63f826772f1aaca43c4afb825f5f143e0263167d5c085c4f41c3

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