Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f5a31397f4a492…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 04:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0bab61abd3bf390ddb8b3a97732525cc SHA-1: fb5ee6cd8604ac516166b0124c848f8b3035e98e SHA-256: a0f5a31397f4a492e6f00456849f008cc5e4c7e94f691c91332dd0f9fbc0d568
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links designed to lure users into clicking on offers for free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/get-free-robux-generator-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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 http://netcdn.tw/app/431946152/get-free-robux-generator-game-hack In PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-roblox-shirt-assets_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/vip-server-free-roblox_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/rxfast-ml-free-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/avatar-roblox-free-items_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-can-you-get-free-robux_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
font_00_sfnt_off00002e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8A 22172 bytes
SHA-256: f461d587e5f17086558f32dbca07d83187d842057f03ccee4be6062bdb1cb3cb
font_01_sfnt_off00005fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 18820 bytes
SHA-256: 3cf5f9b00a39f0cfcbee830171857ad484f6534b8809920e240be9eaf31d3faa

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