Malicious PDF — malware analysis report

Static analysis result for SHA-256 b915e0e50cc4326c…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 08:39:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2cee57d04cf788ca1b32be65b507e17e SHA-1: c2a1d084a1a06093560621b8375a81d5a258b774 SHA-256: b915e0e50cc4326ce466679f00252947ec3cf46482a681796417c56c430083d0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a fake CAPTCHA lure and a link to known malicious redirector infrastructure, specifically `https://netcdn.tw/app/431946152/bux.gg-robux-generator-free-game-hack`. This suggests the document is designed to trick users into downloading or executing further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/bux.gg-robux-generator-free-game-hack In PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-sites-that-work_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_off000050e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50E7 24776 bytes
SHA-256: 4d6f7bcf5834e1cec00c790588258abb1ff31346262cbcc4a4a291a970041b95
font_01_sfnt_off00008a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A23 18700 bytes
SHA-256: c88a23b28e94f61c6d6072fe58037b800dc01792959e31a0398f74b18eb858cf

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