Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a0d4e1e71bd4a1…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 22:32:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d171b48df512bd0783b80c1d9e74f362 SHA-1: dbd982527f64b5d16355314f66301194c49cd6c0 SHA-256: 40a0d4e1e71bd4a18044cc7665afcf52f0cd371bb2fefccdd96f35ca75e9e9e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a game hack or generator. These links redirect to malicious infrastructure, specifically the URL https://netcdn.xyz/app/406889139/coin-master-gift-link-game-hack, which is flagged as a known malicious redirector. The document body and embedded artifacts suggest a social engineering attempt to exploit interest in popular games for malicious purposes.

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-gift-link-game-hack In PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-but_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-followers-on-roblox_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_off00004d36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D36 24896 bytes
SHA-256: 4c816f37babe36c6d24d19f6f4d833280ac7727ce4a48f4a8b639de10acd77bd
font_01_sfnt_off0000867b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867B 17716 bytes
SHA-256: 8f803537a119e07ded82a73af47a81e82657788fe52602d20bb0bf58e866784a

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