Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8e2482612b98c0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-02 06:17:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c82c4a48a58877d37ecf41a13bfee431 SHA-1: cb32e374adf50963ad48fe0620120e6871ff743b SHA-256: 4f8e2482612b98c09e47100ac20ec942e69d4f6c91edabd502d932ca8bbf09ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users. It contains multiple links to known malicious redirectors and infrastructure, such as http://netcdn.co/app/431946152/roblox-free-robux-gratis-game-hack. The document body and embedded URLs suggest a social engineering attack aimed at tricking users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/roblox-free-robux-gratis-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/cheat-engine-not-working-in-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-hack-windows_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-be-a-free-adim-roblox-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-do-you-hack-money-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-win_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-do-you-download-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-robux-for-free-inspect-element_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-game-no-download-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-robux-and-tix-generator-free-download_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_off00003042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3042 22552 bytes
SHA-256: a7038685bd9db14f66b830025afb6cefb1bdf62f52f44dc2085d0c07df906c35
font_01_sfnt_off000062be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 19012 bytes
SHA-256: a57d47200f8c70c15091327ab8d76438dc0a6033b95c4c83016b1da06ea32bcf

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