Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff9eba3c4086f15…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 12:47:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b73f859fc1a278bf1b68e7d4458373d3 SHA-1: 12ebb99a2f7d08d79ef1a41f5938e81fea32a1a6 SHA-256: dff9eba3c4086f158076d9ac38ba1bbe485213d5f07c84503a7d83ec0782b1b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a visual download button lure, suggesting an attempt to trick the user into downloading a payload. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs like 'https://netcdn.online/app/431946152/free-robux-com-game-hack' indicates a likely download or redirection to malicious content. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-robux-com-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pubg-uc-low-price_GM1330123889.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.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_off000050f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F3 24588 bytes
SHA-256: 8323da9199e9fedb7f5d3e135cdb2f3383316fb3355ab99b5cc902a8e35423fa
font_01_sfnt_off000088be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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