Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bf330ce29f0e53…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 03:49:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3024b842a5d0c60f5113a03024291e92 SHA-1: 328d5de734a72678c1d10df251eb171375d40b96 SHA-256: 90bf330ce29f0e5325024390bf2711515895351c26e5372eefa6fe87b6e86e08
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to websites offering game hacks and generators, such as 'how-to-make-free-robux-game-hack'. The ML classifier and specific heuristics strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the document's structure and linked content suggest a social engineering lure to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/431946152/how-to-make-free-robux-game-hack PDF link annotation
    • http://fobh.net/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/are-tiktok-free-views-hack_GM835599320.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/mathep_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/anime-free-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-website_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_off00002ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA0 22432 bytes
SHA-256: 19bdbab3207a8440b150b7e28e2164261231e7277323141eaec7b8d80a7d7347
font_01_sfnt_off0000607c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607C 19244 bytes
SHA-256: 6b22af1083df9260d35a8428a36ac91eb4c7dbc1159f4e02fe88489ba0efcc00

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