Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7ecd409f39ce9c…

MALICIOUS

PDF

34.0 KB Created: 2021-07-19 13:41:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ddd416e2eab254f5c61bd6294244e541 SHA-1: ef04b21f66f77c5946254a01b8033b7b01a20125 SHA-256: 8c7ecd409f39ce9caf49eeb1ad889dde953504c583cf2d4cd43937a2564fa0d6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering "free Robux" or "game hacks", a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of these lures and the overall structure suggest the document is designed to trick users into navigating to potentially harmful external resources.

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/free-robux-websites-2021-game-hack PDF link annotation
    • http://interpretation-dessins-enfants.net/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-free-spins-for-coin-master_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_off00002dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD9 22728 bytes
SHA-256: b865583f10b4ff8244e69ffe1434e5a86665bc6ae1cec9a50f9c12d0ad8f8fc8
font_01_sfnt_off00006086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6086 19024 bytes
SHA-256: b0170c17be8f23a84e249e366aa9381b6dc80aa71edc0927f4b0be829214c04c

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