Malicious PDF — malware analysis report

Static analysis result for SHA-256 66142dfd0a69c9ab…

MALICIOUS

PDF

44.0 KB Created: 2021-05-19 06:30:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 410c9ac390315551190f900b88deb6ee SHA-1: a589772613efb51359d172bd70814c90f54b775a SHA-256: 66142dfd0a69c9abf49353ea678a38fff49459627579bd128a6a6dd8e9baf9c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector for 'free Robux generator' lures. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links. The primary malicious URL is https://netcdn.xyz/app/431946152/free-robux-generator-2021-game-hack, which likely leads to further malicious content or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.xyz/app/431946152/free-robux-generator-2021-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-link-no-verification-2021_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
font_00_sfnt_off00004c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C22 25876 bytes
SHA-256: 6d6e07ef90295282be71de6fc51d22eacb74a5433d0d4e1d6174cc6a894fa95a
font_01_sfnt_off0000880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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