Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2351727c7d5245b…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 05:52:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9b4e9c312bee7a8e05e9f953e5569b3f SHA-1: 0a1e6e1f2008a5e2b44fad7bb6014561984390db SHA-256: f2351727c7d5245b25d244a9be2d0d493e4b86a4424f635b29e574467730a520
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites offering game hacks and free in-game currency, such as 'free-robux-earn-points-game-hack'. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and is part of a link farm designed to attract traffic. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely using JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/free-robux-earn-points-game-hack In PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/demon-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-find-a-hacked-server-on-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-hack-tool-without-human-verification_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/get-free-gift-card-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/tiktok-free-liker-apk-download_GM835599320.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/legit-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/oprewards-com-earn_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
font_00_sfnt_off00002fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAB 22304 bytes
SHA-256: 216e43d14cf3f8358641e9bca052e3b35fa0c6fa2848f19a90d4aab14aa17a8f
font_01_sfnt_off00006168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 19092 bytes
SHA-256: 545181a68f5091574d38dca15c7370fbe5ec5110215882c4fa369d19d146a5eb

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