Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f0e3eb2c7b3432…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 23:21:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2bd2e988597a916168696f3092a2e60a SHA-1: c64039a5274b8ae3e4d8c1351a6ff740b3337da1 SHA-256: d4f0e3eb2c7b34329acc74f2844b85b2806a1b272b9b66fb9eced2abb40edc86
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/roblox-script-hacks-game-hack PDF link annotation
    • http://fccsms.com/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://fccsms.com/images/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://fccsms.com/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://fccsms.com/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://fccsms.com/images/free-robux-no-human-verification-no-survey_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
stream_002_off000033c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C4 25556 bytes
SHA-256: a88706fa67e0e16375020b8051fcda3e3b0d4e22c4a77757b03a631716d3586a
font_01_sfnt_off00006eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 18580 bytes
SHA-256: 535ec4be0d2657e9981f9200dcc4c4c41f6589372ce54f218017d5d6a2e1f0f5

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