Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac01f91414fb640…

MALICIOUS

PDF

34.4 KB Created: 2021-05-21 23:36:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d068e51c3d67c98755bf355014324dd6 SHA-1: acb76078f51edbc076ce2c565d04456f287b4897 SHA-256: bac01f91414fb64013f2ceb18169412e4dd57eca994052b9a454448d5e098ce2
122 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a lure to install a browser extension, aiming to trick the user into executing malicious actions. It contains multiple embedded URLs pointing to sites offering 'free likes' or 'hacks', which are likely phishing or malware distribution fronts. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-likes-2021-game-hack
    • http://libertad74.com/images/free-robux-no-offers_GM431946152.pdf
    • http://libertad74.com/images/minecraft-survival-hacks_GM479516143.pdf
    • http://libertad74.com/images/roblox-printables-free_GM431946152.pdf
    • http://libertad74.com/images/minecraft-hacked-client-download_GM479516143.pdf
    • http://libertad74.com/images/free-coin-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003090.bin
3dd7a235f03089a5421e49f2d6fabd7464f2ea090452b28997fa78976ab52e55		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3090 23596 bytes
font_01_sfnt_off00006608.bin
d258708121255352d461bbf2ed049085888c1bd8d2af1a740053385592fd2202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6608 17860 bytes

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