Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec57cf43c81749…

MALICIOUS

PDF

36.5 KB Created: 2021-05-19 05:17:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1480cbb218a7fb64c7c83606affe0a8e SHA-1: f2237ba00bc761e7ddf81bbcf6f8ed92d07e053a SHA-256: 1cec57cf43c8174961d46707be90c88e2b6175d05163ac8ef844fef9f52dfd46
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious. It uses a fake browser/software-install 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 clean score 0.0312

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.
  • 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/406889139/coin-master-event-hack-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33EC 25852 bytes
SHA-256: a35c8b30fc8f30497099d3df004ddc21bd32c960f778eb7364c8ef0b36979e95
font_01_sfnt_off00006ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBE 17828 bytes
SHA-256: 3aa3979f7db9db60f85c12743f17b039c262b8ea7d603c2f9581d8dcabd3843c

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