Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef580c805671d3c4…

MALICIOUS

PDF

41.9 KB Created: 2021-05-19 16:48:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 924480250298860b16c11d16fea329f8 SHA-1: 79900dd6ac2ea643d95c967dbd02077ed77a8649 SHA-256: ef580c805671d3c46d595f08d49db684baaf6e04719fe980d1c316f8ad334011
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to a resource advertising game hacks, coupled with a heuristic firing for a visual download button. The ML classifier also flagged this PDF as malicious with high confidence. The primary URL suggests a lure for downloading a game hacking tool, which is likely a malicious payload.

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/gameoffice-net-hack-coin-master-game-hack In PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/tiktok-free-to-download_GM835599320.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-codes-2021_GM431946152.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_off00004b69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B69 24044 bytes
SHA-256: ad4222928cd85f2a6ac354f2570bf66e5ef771569487c85b9ba2c7257358b84c
font_01_sfnt_off00008245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8245 17976 bytes
SHA-256: c1b1a17e523e936b349f536870acacfad228736640955d12968774eefee3ad4d