Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f0fc63c74579d7…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 17:47:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 79f112f80e5978a43e8e63fb5ed86fa0 SHA-1: 8093be47ae9e9503a66e5a9f0bdfc3c20ba4685d SHA-256: b2f0fc63c74579d78e752ed9297ef2a9410759676b06a400b03e2e5dea1ab836
90 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and links to external URLs, masquerading as game hacks to lure users. The ML classifier strongly indicates malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, and the external URLs point to resources that likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://netcdn.tw/app/431946152/hack-roblox-2021-jail-bteak-game-hack PDF link annotation
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/hack-avatar_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-to-hack-in-roblox-got-talent_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_004_off000052fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FE 25680 bytes
SHA-256: f8e853c7e6781f17b0d0cb88b994edc9bc0d1db5660b7fee7b2eacafbc61b509
font_01_sfnt_off00008dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFD 18976 bytes
SHA-256: c0db06eb2865fbd6caace25cbcaf345ca05b473c52fd63faf14fe7e24f46c2e5

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