Malicious PDF — malware analysis report

Static analysis result for SHA-256 400b38ceb089551a…

MALICIOUS

PDF

45.8 KB Created: 2021-05-11 19:35:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5d96c3b2e3a3a24d3e160c1a3df13459 SHA-1: 764bf4dec49bc97f44145b8d4e914dee942906c3 SHA-256: 400b38ceb089551ab26af2b420354241726127ba5ab2fe2b2728e0bb6d8323dd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links to known malicious redirector infrastructure, specifically targeting users with lures for free Robux and game hacks. The ML classifier also flagged this PDF with high confidence. The presence of a visual download button further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • 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 https://netcdn.xyz/app/431946152/huskybus.com-free-robux-game-hack In PDF document text
    • http://www.barkas-n-i.gr/images/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://robuxhaxs.comIn 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_off00004d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D99 27456 bytes
SHA-256: db72e314147b546beff14d57a7f640af166cc5638378e81163468169d3ae6fda
font_01_sfnt_off00008fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBD 18688 bytes
SHA-256: 6add98f93d6464e4673e157e466f8eac90a499b9ef5784f234ada041ea0169f0