Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3faa7bcd0cc5258…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 14:19:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a14b7a2ba9d44ffdeaec3297e68a8e4d SHA-1: a91a6aabb4729c96435aee7787e8ef1fb4271bbe SHA-256: d3faa7bcd0cc525828391a173ae0a9b9f262bfea27837b2132b4e7c8dd65cd04
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-robux-not-fake-game-hack PDF link annotation
    • http://eurocomes.com/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://eurocomes.com/images/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://eurocomes.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-connection-lost_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_002_off000032fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FA 26884 bytes
SHA-256: c3167cb644347d6e6ba0ef1f873713b64219face67422c90a6649264e7b8a717
font_01_sfnt_off00006f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F03 18516 bytes
SHA-256: ca79d80576681ece98af22104654f282f19bfdcccdd95bbb76316d29f9029162

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