Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7503ad558127ce7…

MALICIOUS

PDF

34.6 KB Created: 2021-05-23 23:18:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: daea0d08bb12d0743d1e73f7dd2166a9 SHA-1: 6a20cd4e911f35ad74c3bb5a5b95dabd30c6a01d SHA-256: d7503ad558127ce7ed494a0fab026fb14545abdd0b2b38c6f48ed635976e2cdb
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 0.9508

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-views-on-tiktok-game-hack PDF link annotation
    • http://julo-it.net/images/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-fan-page-free-spins_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_off00002dd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DD8 25640 bytes
SHA-256: 5165c74c17f3ba53118fa445257369c836948b6bdf9d4e4d593dbeef34339917
font_01_sfnt_off00006774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 17752 bytes
SHA-256: 0bba4198fd0ca9d20010dde6368f831223727c1fd110b32f8bd9ae0070f69573

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