Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab8e60d993df6fb…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 11:05:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e4b143b33b6cb915ebd977cc82680de SHA-1: 54f227032df950708cb5561d9df8bf2d3136ad2d SHA-256: 5ab8e60d993df6fbeab83f79dc21333bfebb8fa25263de351348ebca03a2c771
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various websites offering free in-game items and currency for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a phishing or scam campaign designed to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/free-roblox-robux-codes-for-roux-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/get-robux-for-free-with-out-choice-of-getting-extra_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-the-real-way_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-collect-free-liverpool-scarf_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-stuff-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-official-app_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-site-youtubecom_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-blox-hunt-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-coins-link-2021_GM406889139.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_off000030ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AB 21976 bytes
SHA-256: da1671827a4d5cf9721473e90db37ff8ea8a95ce896379edd5ed71a37a5d4fdd
font_01_sfnt_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 18964 bytes
SHA-256: a542f0922d117aea46058e2bec4a0a4fdd1639b324fc31b4f5f27be6e52c4ca3

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