Malicious PDF — malware analysis report

Static analysis result for SHA-256 f850c5febb1d902e…

MALICIOUS

PDF

34.9 KB Created: 2021-06-21 13:33:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 45085dcf2de9237f951df2e6049ca59b SHA-1: 5f097a7f559d95113be5ee0d2d223bcb5f99536d SHA-256: f850c5febb1d902eeddc7ee9b28773972089059ea371bae324666da883ee1d92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically targeting users interested in game hacks and free in-game currency. The document body and heuristic firings confirm the lure is for 'free Robux' and similar game-related exploits. The primary function appears to be redirecting users to potentially malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-robux-crystalsheep-game-hack In PDF document text
    • http://learningarabic.co.uk/images/free-robux-just-by-watching-videos_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-hacks-mrantifun_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-robux-with-inspect-element_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-cheat-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-snowman-package-free_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/hack-de-robux-infinitos-en-roblox_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-hack-2021-get-free-robux_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/hack-to-find-peoples-game-in-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/adonvip-roblox-hack_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/all-the-free-hair-in-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
font_00_sfnt_off0000301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301B 22352 bytes
SHA-256: 7bf69f0c784638d1896b359282988a2ec70b96a554d5a01ea95f6908498faef5
font_01_sfnt_off000061cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 19580 bytes
SHA-256: 21b491180d3b3bb363953a9298df8edee7fd264be8ec6458943c6b4b4e76a528

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