Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a600c74e79cb86…

MALICIOUS

PDF

34.7 KB Created: 2021-05-20 14:52:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 56bc595b296c40a930b22937fbe64142 SHA-1: 096a63c71a40711fa2c58a0309f5eac3a023dfd8 SHA-256: b1a600c74e79cb867bea418c33cbfffd916d725a8d3a08523f3258386dbc9b8e
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure and 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 0.9648

Heuristics 6

  • 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
  • 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-fans-on-tiktok-game-hack PDF link annotation
    • https://www.devries-group.de/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.devries-group.de/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.devries-group.de/images/daily-spin_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_off0000315c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315C 23948 bytes
SHA-256: b71c425bcd3fa7826a9ff87c8a61d87315abb0e28f9fbd98ce2a725503c771d5
font_01_sfnt_off000067d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D1 17684 bytes
SHA-256: c4bad94708efb6699dc1c2f19668affdeb9abfa27890915707a4ba319d25bbbf

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