Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de5a2ada8988e0…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 01:24:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8f7d1c522a8675e3515f69cb576a1430 SHA-1: bbeb8c0aac7ba48537e8a7283905aeccacd82955 SHA-256: 91de5a2ada8988e05bfed54878ec76a6ca65f00007fde34f5ec4276ba250216d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure. The document body and embedded links explicitly mention 'free coins', 'spins', and 'hacks' for popular games, indicating a lure for users seeking cheats or in-game currency. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-coins-and-spins-link-for-coin-master-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site.

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/free-coins-and-spins-link-for-coin-master-game-hack In PDF document text
    • https://www.gymun.cz/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-with-no-verification_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_off00004ab1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB1 24824 bytes
SHA-256: 26139184b548640b825d7476e389a452528681919640ab47754bd91258cca618
font_01_sfnt_off00008430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8430 18228 bytes
SHA-256: fae37dc17ceb07b546b2f3d52ac1615337fed2095fc086aa036c35b62a4bdec6

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