Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c7ecac13f8634a…

MALICIOUS

PDF

34.1 KB Created: 2021-06-19 19:27:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0a312c9b174d2b521c3c8da2bb45ede8 SHA-1: e16db9ffbe8d47912011d6f2fc8bd0ed85f174b8 SHA-256: 92c7ecac13f8634a010746953e1bf1d7d7c051bfcdb00fbd51babf05d8f4f3e3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users into clicking embedded links. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-2021-game-hack, which likely serves as a redirector to a malicious site or a phishing page. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and URL findings.

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.co/app/431946152/free-robux-2021-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/free-robux-icon_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-admin-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacking-a-fans-roblox-account-projectsupreme_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-on-chromebook_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_off00002ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED1 22116 bytes
SHA-256: 8e0b9d253d1b5f3cd34786419d5e1475c028fe93632894e8cdc4b3ecb8700cde
font_01_sfnt_off00005ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 19116 bytes
SHA-256: bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a

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