Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b92aeb7f8dfb7…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 08:00:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 719f2c6444cdd17890778876495d0453 SHA-1: c56688b3a1dde17dd16b20088e7852434e194c33 SHA-256: 1f4b92aeb7f8dfb7ba185225563ad5bbdcffd4fcd05f1106cb1aae0b8665e93e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample presents a fake CAPTCHA to trick users into downloading a payload from an external URL. The document body contains obfuscated text and embedded URLs, including a primary malicious URL. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/get-me-robux-game-hack PDF link annotation
    • http://dana1157.com/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://dana1157.com/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://dana1157.com/images/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://dana1157.com/images/can-you-get-free-robux-on-roblox_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
font_00_sfnt_off000047bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47BF 26888 bytes
SHA-256: 3933e64398f7b93b4cd49e7554a5b6f7d93e40079a62974842a0007c14780af8
font_01_sfnt_off0000869f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 18152 bytes
SHA-256: a45e33870dcdfec4be2d188e583d66387a562064ddf1ebe544b9a56fe2c1f10f

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