Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe287da11192078…

MALICIOUS

PDF

34.2 KB Created: 2021-07-19 09:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2f101f781b67973b04758e7562661e5a SHA-1: b1a0109f3e934e21fe95e57b6e1710aaea60575c SHA-256: cfe287da1119207893f17b2a61b74f0856df5fb7fc8b3affb79a87bd67fc3903
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux generator" which redirects to a malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into visiting a site that likely hosts further malicious content or exploits. The presence of multiple game-related lures indicates a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.tw/app/431946152/how-to-get-free-robux-2021-game-hack PDF link annotation
    • http://www.duchidicastelluccio.it/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/minecraft-free-no-download_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
font_00_sfnt_off00002d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3F 23292 bytes
SHA-256: a8108cf15e6c1463a2f1d91a5436752a9ba1926a979ce97ac1b8d53e6292f7ad
font_01_sfnt_off000061b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 18868 bytes
SHA-256: a5d6d97ab978757aba4ef486352919807cfdbbfc3a04ca685304abf2b11b5df3

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