Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a3c2792460d4e6…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 10:22:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ed5f34522d80d3204ac6ac59f529e33e SHA-1: 9c4d2b6ab129fcc7aa8e98175de9d632bfa545ba SHA-256: a5a3c2792460d4e65e831705057b5907221092f3952960b04355d24b77d054c2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link and text related to 'free Robux' and 'game hacks', directly luring the user to click. This link, http://netcdn.tw/app/431946152/give-free-robux-game-hack, redirects to a site associated with malicious activity. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/give-free-robux-game-hack PDF link annotation
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/hack-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/i-want-robux_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.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_off00003245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3245 21996 bytes
SHA-256: 006cc26cc1fe694955a789829d74fe890e0b55fae28edd400ef79fa9efd3a5e7
font_01_sfnt_off000062d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D9 18952 bytes
SHA-256: 099c16aecc59e05ee2a67675ac57707afb633d1d3f2ee222ad3cc0024ed5c63f

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