Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22dd8e6d2519eaf…

MALICIOUS

PDF

47.1 KB Created: 2021-06-14 01:29:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 27c5bb4782b93249c183fb4912dcb0fe SHA-1: 124ac0bf494a923615f49d5789faa027d1011b79 SHA-256: f22dd8e6d2519eaf5822a04ea46a6e3769e1a9125db1c9d29199cdaa6db2a666
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to entice users into clicking embedded links, which are likely intended to download malicious content. The ML classifier also flagged this PDF as malicious. The primary IOC is the external URI pointing to a potential download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 http://netcdn.co/app/431946152/how-do-you-get-hacks-for-roblox-2021-game-hack PDF link annotation
    • http://ines.co.rs/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/codes-for-free-knifes-assasin-roblox_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/my-wife-hacked-my-roblox-account-when-i-was-sick_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/earn-free-robux-scam-sites_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-2021-no-human-verification_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_003_off0000494f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494F 25788 bytes
SHA-256: 93025881e97f55947e5b750f7439ea90e6597fa5a58af95da8fe13ca55fe9825
font_01_sfnt_off0000853f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853F 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000091e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E7 19484 bytes
SHA-256: 5afb32f18f7935ab646d45736f4bdeb6c6a27bc1d523ead9212588e665e56ec3

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