Malicious PDF — malware analysis report

Static analysis result for SHA-256 45edc8a3028f9c55…

MALICIOUS

PDF

45.0 KB Created: 2021-05-16 12:03:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a7c01cc2aa30d10d4ae54e7bc44396a SHA-1: ab883baef8e5b90cdd7dfe008b4244f25827cc44 SHA-256: 45edc8a3028f9c558f0fed885d190913d0122c7577e251fd6038dfa17860d1de
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a fake CAPTCHA lure, designed to trick users into downloading a payload from an external URL. The document body and embedded URLs suggest a theme of free game-related items, likely to entice users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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.xyz/app/431946152/free-roblox-shirt-templates-2021-game-hack PDF link annotation
    • http://bassacctaxservices.com/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/body-roblox_GM431946152.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://bassacctaxservices.com/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/hack-avatar_GM431946152.pdfIn PDF document text
    • http://bassacctaxservices.com/images/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://bassacctaxservices.com/images/coin-master-free-rewards-link_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
stream_003_off00004ba0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA0 27044 bytes
SHA-256: bb58290c71cf4d5183fc5b2503552ec20f1155d18e637c35cf1e7f88caa8bd67
font_01_sfnt_off00008a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A48 19404 bytes
SHA-256: ab8fe64e6c41782caa49eba716c047f70273e0fcd9fd260fc178e39564bef5ea

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