Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52b496503e7125b…

MALICIOUS

PDF

34.0 KB Created: 2021-06-18 23:07:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a357688c1ac66109ab8c6a076532ffd0 SHA-1: 132e27ace418e254c2b95d2651389f71ff4dfa51 SHA-256: d52b496503e7125bc64396954ee1e64b65c23010c1165e5d1bd9dd0ea131cf59
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as generators or hacks for popular games like Roblox and Minecraft. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm or SEO poisoning tactic. The primary lure appears to be 'Free Robux', aiming to entice users to click through to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/free-robux-no-deals-game-hack PDF link annotation
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-jailbreak-noclip-and-speed-hack_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/descargar-roblox-hackeado-para-android-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/install-coin-master_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_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_off00002f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7A 21992 bytes
SHA-256: 658e897838e55488775e7427a1afc0e948dfb9f273dff8107aa4efbd7137721b
font_01_sfnt_off00006032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 18960 bytes
SHA-256: 67cf37cf0e68e90b2e6396a1d50a3bee37f0f1c52c67a51bf8e945d111511bc6

Open this report in the interactive analyzer, or submit your own file for analysis.