Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1efb2ce835c485e…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 21:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f7acd0feb5421ba53a9ccfd46eb41aa1 SHA-1: e2eab51f4bcbd1ab283cc068d5c06973ec1613c6 SHA-256: b1efb2ce835c485e2835b54c3cdf8d477946916cfa395dbbc9a045242593695f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures for game hacks and free currency, directing users to the URL http://netcdn.tw/app/431946152/roblox-free-body-game-hack. This URL is associated with a high-severity heuristic indicating a game hack redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the document's structure and embedded links suggest it is designed to trick users into downloading a second-stage payload.

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/roblox-free-body-game-hack PDF link annotation
    • http://upes.edu.sv/ckfinder/userfiles/files/download-hack-roblox-pc_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/is-it-possible-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/ccv3-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.upes.edu.sv/ckfinder/userfiles/files/adonvip-roblox-hack_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/easy-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-v3rmillion-hacks-youtube_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-robux-with-no-survey_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_002_off00002f32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F32 22844 bytes
SHA-256: 1510022f0852f5300006191ad7da0d27234f4f674dbef0b5bdc3462d0c3c1fb8
font_01_sfnt_off00006242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6242 19004 bytes
SHA-256: 00d76505c5d5d340f2af2994da5646750aa23f2ea04bc02496aab4ee0fa4eed0

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