Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfb896d4b2b6d3e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 12:47:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63ee7bdffa5e9b85a7df6c490fc52249 SHA-1: f22db656825d549c441009a256a007e1a208d92a SHA-256: 5bfb896d4b2b6d3e25fee00185b771d32594700962bff6c48d11bf2f02a2b798
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as game hacks and generators. The primary lure URL is http://netcdn.tw/app/431946152/how-to-hack-someones-account-on-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow, likely intended to lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-hack-someones-account-on-roblox-game-hack In PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-breaking-point-aimbot-hack_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/is-roblox-free-on-psn_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/descargar-roblox-hack-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-speed-hack-2021-cheat-engine_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/como-hackear-la-cuenta-de-alguien-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/como-meterse-en-la-tienda-free-de-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-no-human-verifaction-and-survey_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/hack-coin-master-ios_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_off000031d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D2 22456 bytes
SHA-256: c1edcd646fc7ad5e7d5afffa44dcd7b1f9c1959b4d709836530f57b502f71172
font_01_sfnt_off000063e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E4 19324 bytes
SHA-256: 28ba82939c936f9b01a7caeed75c50b5986faeea817d1276e3bf1f7a5f42653e

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