Malicious PDF — malware analysis report

Static analysis result for SHA-256 7593603e58700218…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 18:03:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b5aee91a09e89bdc801a59baa5c64e73 SHA-1: 4856b638996b8b79b5c5c88998d73679ab7a12ef SHA-256: 7593603e58700218bec10b2001544f08b85779df3d6c06f409c367635c754ab5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which redirects to the URL http://netcdn.tw/app/431946152/roblox-robux-hack-generator-game-hack. This heuristic, combined with the ML classifier, strongly suggests a malicious intent to redirect users to a site that likely hosts malware or phishing content. The document body also contains numerous links to other potentially malicious PDF files related to game hacks and cheats.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/roblox-robux-hack-generator-game-hack PDF link annotation
    • https://pasca.unisba.ac.id/elibrary/repository/cheat-engine-undetected-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/pokemon-go-free-meltan-box_GM1094591345.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-verification-download_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/paginas-web-para-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/can-you-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-roblox-shirts-girl_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/wright-your-password-for-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-no-scams-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/fake-free-robux-place_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/insane-admin-hack-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-minning-ticoon-vidos-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-free-robux-2021-pastebin_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_off00003125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3125 23248 bytes
SHA-256: c7f639ffbc11ec325b5c0608d39c11ad7ca5a3ed5d24884f492eeab6e008aa8e
font_01_sfnt_off000065b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 18900 bytes
SHA-256: e419110d4009e271ea11aee689c1aa7fe2ca079d33d0815bd6a59eb0f8b0c4e6

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