Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a9d5973fce0517…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 11:09:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 291a5e5dbc1e3ba07ce27cfe3a2982a7 SHA-1: f4817df4b511b754259f90b56b692b71fdbd5474 SHA-256: c4a9d5973fce051705cf3ce2aa4915e3e1c9efee3cf3254bf8204f8aec50c1ab
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a lure related to 'free Robux' and game hacks, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded links and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-free-robux-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/demon-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-using-es-filer_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
stream_004_off000054d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D8 28208 bytes
SHA-256: f80887087c083024587adecea35147a3963c7ab26eaa25074df2a28ac96d4e80
font_01_sfnt_off00009864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9864 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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