Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf3a314baa5c18b…

MALICIOUS

PDF

45.7 KB Created: 2021-06-08 16:48:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f4cb47a97705e46c56940e3d396103dd SHA-1: ebbf318525354721106255f811a145cc57a461a3 SHA-256: 5bf3a314baa5c18b9b34e7e2d298ebe06215f8e7ab3b7bf2f09c3fe22fd698cc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary link pointing to a 'game hack' lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially malicious websites, likely for malware distribution or phishing. The document body's garbled content and the authoring application (wkhtmltopdf) suggest it may have been programmatically generated to host these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-ancient-erath-cheat-pastebin-game-hack PDF link annotation
    • https://shimony.net/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/free-robux-today_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://shimony.net/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/website-for-free-exploits-roblox_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/whats-the-best-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/wurst-client_GM479516143.pdfIn PDF document text
    • https://shimony.net/images/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://shimony.net/images/robux-generator-no-verification-2021_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_004_off00004ee0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE0 27976 bytes
SHA-256: 5467bec56724b2c8b0c6ee8ed3124b7601cf3882ca687e5fb205cfd3d09a281c
font_01_sfnt_off00008f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 18556 bytes
SHA-256: 22b55442e6dc76c1862dba6e2e9ffddee7406fb4b6cc63634abd9e9e193cc2f4

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