Malicious PDF — malware analysis report

Static analysis result for SHA-256 925964e17a5ed187…

MALICIOUS

PDF

44.2 KB Created: 2021-06-09 15:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d713d7b165293adb92289e2bb2251007 SHA-1: 6b31e2f9d86a31b0f4149eb8a0acacc610cc1503 SHA-256: 925964e17a5ed1877caba062bfdcfec38454d0c7d8ea2fe9d74ef131758b2170
82 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a visual download button, strongly suggesting a lure to download a secondary payload. The heuristic for password-protected archives indicates a common technique to bypass initial security scans. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-gametest.roblox.com-accounts-game-hack PDF link annotation
    • http://autoskola-scp.com/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/como-tener-robux-hacks_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-robux-on-phone_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
stream_004_off00004fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE6 24592 bytes
SHA-256: 573ef1af8383a7344fe254781a5c8402737a689fe885fa035c39325561390322
font_01_sfnt_off000088c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C1 18748 bytes
SHA-256: d5d633ab507a85f2cee41d9656cc3ca5cdfe647c17bfe42c6bc6141816ce2484

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