Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff786d6951a22b24…

MALICIOUS

PDF

46.8 KB Created: 2021-06-08 22:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db7ceee66f5c0c10d5ce75efae62cd67 SHA-1: ccc3862f6c64a51e7b7a14ecd8e2e2c8d8a094c0 SHA-256: ff786d6951a22b24921627b33ea8519eb56eb70a0408f8e6cddef9859e766459
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'generators' for popular games like Roblox and Coin Master. This indicates a lure-based attack pattern designed to redirect users to potentially malicious content. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of these links were generated programmatically, likely for SEO manipulation or to distribute malware.

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/hacks-para-roblox-windows-10-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-adopt-me-free-vbucks_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/link-for-free-coins-in-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
stream_004_off00005418.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5418 25968 bytes
SHA-256: e33fa85f198ac9e7e90eed4b85c05e351bdb0608cd43f209c25ab81d8c2d5d22
font_01_sfnt_off00009128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9128 19268 bytes
SHA-256: 54ac09a17f0107712ce327b5df3b33c7770551e0f84c2e3138d8c93d274b6212

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