Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a41f812f877abd…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 03:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ac5dca3b999422dc785b90dce9ba968 SHA-1: 1e66ae0c3e67b1e90ccaf008297240898ac2c472 SHA-256: c1a41f812f877abd5e682b3810db333a2bef336e83fb7f7e4a885a56e8cd8b54
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains a large number of embedded URLs, many pointing to other PDFs hosted on `grupodin.com.br`, suggesting a link farm designed for SEO manipulation and traffic redirection. The primary URL `http://netcdn.co/app/431946152/comment-hacker-roblox-robux-game-hack` likely serves as a gateway to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/comment-hacker-roblox-robux-game-hack PDF link annotation
    • http://grupodin.com.br/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/hack-prison-life-roblox-noviember2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://grupodin.com.br/images/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/hack-app-for-roblox-pet-simulator-free-pets_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/pokemon-go-free-on-pc_GM1094591345.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/roblox-ff-hack_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-free-spin-and-coin_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_off00002ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA1 22368 bytes
SHA-256: d7a98c8b9d607b04985d19381b231f4b1fec6436fab517700133b9cb8ffb60e9
font_01_sfnt_off00006069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6069 18976 bytes
SHA-256: 13aa67afe68b12a71ad782deb91f76e57b2ce63cc60d5bb51b1dd19daf870255

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