Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf55dc8ec52a884…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 04:32:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54bd06d641217a9dbfff2e15c5a81a9c SHA-1: 58e3d3faf39fee7c3943f0524c31032c67dad09f SHA-256: 9bf55dc8ec52a884220943e213c3bb637e1e0b91b92dbeb7c8d49237149cd6da
142 Risk Score

Malware Insights

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

This PDF document contains numerous links disguised as game hacks and free currency generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The primary lure URL, http://netcdn.tw/app/406889139/coin-master-free-spins-2021-apk-game-hack, likely leads to a malicious download or phishing page. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/406889139/coin-master-free-spins-2021-apk-game-hack PDF link annotation
    • http://opac.disarpus.surakarta.go.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/iron-man-simulator-roblox-war-machines-hack-lua-c-script_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-become-a-real-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/crystal-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-a-roblox-account-with-forgot-password_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-card-code-generator-download_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-unused-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/all-cheat-roblox-all-games_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-hack-page_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-2021-no-human-verification-no-download_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/the-community-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/cheat-codes-vehicle-simulator-roblox_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_off000032e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E8 22724 bytes
SHA-256: 88d31874743dc3c04bd2e9f539e80c90983cb0f1c85af85accec360d8a78b0fe
font_01_sfnt_off000065d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D2 18748 bytes
SHA-256: cd997a0892ed44687906c5418bb53484d5137fdf47ea2b433c73ebdb92c18661

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