Malicious PDF — malware analysis report

Static analysis result for SHA-256 b505fa573b4deddd…

MALICIOUS

PDF

38.5 KB Created: 2021-05-21 21:06:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c85f3bee6ad15c4daae165d84c9a48fc SHA-1: c3dd7062f1d141c271d497f300cbe49bfd598cd7 SHA-256: b505fa573b4deddd459700114099e5bef5b9b2e01a0d4ffbbb46a0b7e87bcc0b
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into clicking a link for a game hack. The document body and embedded URLs promote "Coin Master" free spins and coins, and several URLs point to other PDF documents hosted on the same domain, likely serving as further lures or redirects. The primary malicious URL is https://netcdn.xyz/app/406889139/coin-master-free-daily-spins-and-coins-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/406889139/coin-master-free-daily-spins-and-coins-game-hack PDF link annotation
    • http://lcs-schlieben.de/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-spins-and-coins-for-coin-master-game_GM406889139.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
font_00_sfnt_off000033af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AF 24084 bytes
SHA-256: a7cb4c231d8388217a97f3061dde7d50d8818606715f556a381817bc54cfc252
font_01_sfnt_off00006a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A22 2932 bytes
SHA-256: 7aee9e503a5ce204a8a322bb3f7914cecf17d3f4dda4772d0d3ff378ba95a3d6
font_02_sfnt_off0000744a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 18480 bytes
SHA-256: 88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b

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