Malicious PDF — malware analysis report

Static analysis result for SHA-256 658086da87e44c5c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 08:28:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 577e9602886c9872d63433e81078d99b SHA-1: 76072dcd35c21c04ed6cd73107c8a5fd8c06ca64 SHA-256: 658086da87e44c5ce437ddebfc57503827ea7cb8919ceb0e99218eb1e8a3ee4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a game hack redirector, specifically targeting 'Coin Master'. The document body and embedded URLs reinforce this lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-coin-hack-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/caught-my-girlfriend-cheating-on-me-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-studio-install-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-the-stuff-from-roblox-hack-week-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/omg-this-worked-how-to-get-1-million-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/good-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-shirt-maker-download-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-private-server-free-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-building-hacks_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-discord-group_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/rocashcom-earn-free-robux-by-watching-videos-abd-completing_GM431946152.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_002_off00003398.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3398 22692 bytes
SHA-256: b7078a108db7bf9fe9b43a74563fdc9916b217d29f21a51bf7ceaf2ceffb6c25
font_01_sfnt_off00006662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6662 18168 bytes
SHA-256: f6a958b5ee3bd5b31fa7bb34e70f4f188eadbb3e5a663de667095cc8c499d1ed

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