Malicious PDF — malware analysis report

Static analysis result for SHA-256 86566f0120b8f059…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 11:06:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f7d764e40bcb543a72e1ac3a8e3255b2 SHA-1: 4c9c8f3e884de26ef58706d027b2127de9a5f503 SHA-256: 86566f0120b8f059e218f78ea5f3ba501b84a97f1154c995ccd43364bbdecc5a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are presented as game hacks or generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically identifies this pattern, indicating a likely attempt to redirect users to malicious content. The presence of a 'download button' lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/fishing-simulator-hack-roblox-game-hack PDF link annotation
    • http://io24.com.ar/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-account-that-have-robux-that-are-100-real_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-cheat-in-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-login-free-no-download_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/tiktok-free-ads_GM835599320.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-link_GM406889139.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-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-hockey-mask-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-jail-break2021-money_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-apk-2021-download_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
stream_004_off00004efa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFA 28196 bytes
SHA-256: 1d90c226cecad94d74f85d4e00176a4020615ee0ed83b0613a859b1ac22af2d0
font_01_sfnt_off00008f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F86 19424 bytes
SHA-256: 1d8276517d61f69f2a77ed9fb8241fdfe37293aa15bec1f1e6b5c64dd9939164

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