Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c88fa98dc724611…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 17:25:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 72d3f2c0a0bcb17f26f44d9536eacb60 SHA-1: 2f0ea88d7b665acaaff0ae7c4789281bf4492d0d SHA-256: 0c88fa98dc7246119b5a234b0fd6fa026d2c5b508b819e4445314b826336afb2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to game hacks and free generators to trick users into clicking a link. This link, http://netcdn.tw/app/406889139/coun-master-game-hack, redirects to a malicious domain, suggesting it's part of a phishing or malware distribution chain. The presence of multiple similar URLs in the document body further supports this. No scripts were extracted, but the overall pattern indicates a phishing attempt to deliver a second-stage payload.

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/406889139/coun-master-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-dragon-adventures-cheat_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacks-for-big-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-free-promo-codes-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-4-free-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-money-script_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/counter-strike-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-generator-no-ads-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-human-verification-2021-real_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-a-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/shadow-raid-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hack-tycoon-simulator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-piano-hack_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_off000032d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D6 22184 bytes
SHA-256: 2d3dd26703062ef628c5a12cb01b4e2707a2fe7f9ff0d9fb03ca6cb47839d8c2
font_01_sfnt_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 17856 bytes
SHA-256: a248657c98370cc2bb7e99f773c123f15ae7091518c20bef8c5b84faaed720ea

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