Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0ba176f1f6fd81…

MALICIOUS

PDF

35.5 KB Created: 2021-07-01 17:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 675ef8ca8e13deb97c117d45c7981d82 SHA-1: 64ea697dae141edb26c8a2bc5e69c857885379e0 SHA-256: cb0ba176f1f6fd81299b0b743b3a5c85e7ac06b7fa205e91e06d644e50a86b50
122 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks and generators, impersonating Microsoft to trick users into clicking a malicious link. This link, http://netcdn.co/app/431946152/hacked-by-roblox-id-music-game-hack, redirects to a credential phishing page. The ML classifier strongly indicated maliciousness, and the presence of external URIs and brand impersonation confirms a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/hacked-by-roblox-id-music-game-hack.
  • 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.co/app/431946152/hacked-by-roblox-id-music-game-hack PDF link annotation
    • http://www.med-aid.vn/ckfinder/userfiles/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-working-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/roblox-race-track-free_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-codes-in-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/roblox-jailbreak-hack-2021-october_GM431946152.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://www.med-aid.vn/ckfinder/userfiles/files/how-to-make-own-roblox-shirt-free_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_off000031a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A6 22644 bytes
SHA-256: fbd0a4a7c433e69e3bbf0ffe558b67f65a1a99b1f887b9a78ab0f3cd03409684
font_01_sfnt_off0000647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 19464 bytes
SHA-256: 2cb28df1e7cba2e95089b6e9c810cfd3169ec0946a41296027e3ed39b5e79722

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