Malicious PDF — malware analysis report

Static analysis result for SHA-256 2090986fd73cfa6c…

MALICIOUS

PDF

43.4 KB Created: 2021-05-18 04:55:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f590701680a2a917422fa8370a59e19 SHA-1: 501187debd2f5a7fef43094816aa09d50768b222 SHA-256: 2090986fd73cfa6cc1e1b3beab6c7fb001cb6342af363fce48b6e4e322fed4d6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and a lure for a "game hack" related to Coin Master, directing users to malicious URLs. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a social engineering attempt to trick users into downloading potentially malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.xyz/app/406889139/coin-master-hack-mobile-game-hack PDF link annotation
    • http://brinicombe.co.uk/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/add-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-a_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004728.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4728 22996 bytes
SHA-256: 6460a1a9c900d5e07d1186b56101829667b43128cf36c9259def1070c80bf3d8
font_01_sfnt_off00007a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off000087f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F4 17948 bytes
SHA-256: d85bac05a6c530c5997aad474557790cc9f5c9ab79cb3a200cdd52cd9bbf1317

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