Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c7bfde891afd6f…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 12:22:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d8e0626f4e39eb8c3ce7ce632985e1b4 SHA-1: 2faf66164b02ec0ef210484c4eab08a12e04adbb SHA-256: 81c7bfde891afd6f977a68544f8eadcf9b9aa80285591137d29e6aa916c42d87
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites promising game hacks and generators, such as for Roblox. The primary lure URL is https://netcdn.tw/app/431946152/roblox-login-free-no-download-game-hack. This pattern suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-login-free-no-download-game-hack PDF link annotation
    • http://io24.com.ar/images/cheats-for-getting-money-in-roblox-meep-city_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/hackear-el-roblox-med-city_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/pokemon-go-free-latest-version_GM1094591345.pdfIn PDF document text
    • http://io24.com.ar/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/tiktok-free-ads_GM835599320.pdfIn PDF document text
    • http://io24.com.ar/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-06-accounts-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-how-to-get-free-gear-2021_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
stream_004_off0000527f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527F 25468 bytes
SHA-256: 6fdf944f960f58eb6e9cd7e6ddd84380b10eda7d4dc8fa09fdfa882ba7c057ec
font_01_sfnt_off00008ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE0 19088 bytes
SHA-256: 91357c1a9f695e17ec6f41bf4ff09a653aa7b0c47e807357c4beba8abb175184

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