Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad17eb173dec53d0…

MALICIOUS

PDF

50.6 KB Created: 2021-06-07 08:40:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4240de10b6a78fc35a6e410b078fab81 SHA-1: 159ce2890b30b67e4232ba6aa7f72a099aa8ace0 SHA-256: ad17eb173dec53d004690584eee4a9e170bb23398cb3f608a912c405b6cc32b7
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a heuristic firing for a browser installation lure, indicating a social engineering attempt. The document body, though heavily obfuscated, contains references to 'free Robux' and a URL pointing to a download, suggesting the user is tricked into downloading a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 4

  • 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
  • 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 https://netcdn.tw/app/431946152/https-free-robux-no-download-game-hack PDF link annotation
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/get-robux-com_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/pubg-uc-ykleme_GM1330123889.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://elearningmi.mibustanululumtulungagung.com/__statics/gudangsoal/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55CC 28912 bytes
SHA-256: 068d936f950873e34f9e194f4baf1f1abdb640f34ae2c749b43b59574c3e88ce
font_01_sfnt_off0000970a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off0000a0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CC 19104 bytes
SHA-256: a41f4b5a62831792066e7de55092f6d770df3cbbed2eaeb7f9e3c9d52a68939f

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