Malicious PDF — malware analysis report

Static analysis result for SHA-256 45637db5969bc852…

MALICIOUS

PDF

44.1 KB Created: 2021-06-08 14:57:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0ff94152efbc67b342ce4ae3645c486b SHA-1: 68bcb52d39b193615889eefdd3cea123d1aee391 SHA-256: 45637db5969bc852876226576140c893b75a04536e94f4dba022653381a9bc5c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of 'free Robux' and game hacks to entice users to click on external links. The PDF contains a large number of links to other PDFs hosted on 'firesafetyservices.biz', suggesting a link farm or SEO manipulation tactic. The primary redirect URL is 'https://netcdn.tw/app/431946152/free-robux-real-roblox-game-hack', which likely serves as a gateway to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-real-roblox-game-hack PDF link annotation
    • http://firesafetyservices.biz/images/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/cheatotg-roblox_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-tiktok-fans_GM835599320.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_off00004dcf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCF 26084 bytes
SHA-256: 681480507acb2cd401185c9c138dee7240d1805db6f5ace3b7637972ed6c3730
font_01_sfnt_off000089c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 18316 bytes
SHA-256: 0bff543ee19f4ca1641aaad3399cdc0a52c610caf2abd08cd8655404047fbeff

Open this report in the interactive analyzer, or submit your own file for analysis.