Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dcb45d3c7c33b9…

MALICIOUS

PDF

34.0 KB Created: 2021-06-20 08:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2a9b96bbb5495a5b516ec3ff1052757d SHA-1: e5bd5b1066338187c0ca70b3cac880568ccbaecb SHA-256: 23dcb45d3c7c33b90e3d923c58ab898627eeb993e47bfffe173b3e17b5681fd8
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. It contains multiple embedded URLs, with the primary malicious URL being http://netcdn.co/app/431946152/free-robux-2021-game-hack, which likely serves as a redirector to a malicious payload or 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://library.ulb.ac.id/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wiek-ann-man-sich-robux-hacken_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/youtube-how-to-play-roblox-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/https-www-roblox-com-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD7 22248 bytes
SHA-256: 0944eb1894a050abe4c19730d37b5e84fa3b74606e1b78ea655767c25355b0b1
font_01_sfnt_off00005f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F66 19116 bytes
SHA-256: bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a

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