Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ab3590ffbc761a…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 06:31:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 35fdbb655fb7f5b3aaa5186491fabe66 SHA-1: 0abbda9c0869d4a890c058977b33c2e75dfbaec4 SHA-256: 66ab3590ffbc761afa53aa11b43d0d6df559c1a9abae2814da1f32931daf67d5
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains embedded links to known malicious redirectors and lures the user with promises of free game hacks or currency. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button and browser installation lure further supports a malicious intent to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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/431946152/huskybus.com-free-robux-game-hack In PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/app-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-g_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_003_off000047fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FC 25940 bytes
SHA-256: 093c574bb99fb719380cbb3a3fd2fa23fce713b00caa0d91048ea3ce806eafe5
font_01_sfnt_off0000822d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822D 18688 bytes
SHA-256: 6add98f93d6464e4673e157e466f8eac90a499b9ef5784f234ada041ea0169f0

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