Malicious PDF — malware analysis report

Static analysis result for SHA-256 642d4ff21568ee20…

MALICIOUS

PDF

40.6 KB Created: 2021-04-28 18:36:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 511e11cf9f0435b8176397b7be5b86a8 SHA-1: bbce43d441b54a4617379453c15d30ac64e25bb9 SHA-256: 642d4ff21568ee201f7d0b92bd9f887a9ddaa22ff6510b17a5d62beaa8ac81a9
122 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. 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 0.9941

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/431946152/to-cash-free-robux-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/roblox-speed-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/welcome-to-farmtown-hacks-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-account-with-domino-crown-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-swords-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-free-robux-raffle.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-to-get-clothes-in-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/street-fighting-simulator-infinity-stat-hack-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/todos-los-juegos-de-roblox-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-in-speech-bubble.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hackeado-con-robux-infinitos.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_003_off00003fc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FC1 27216 bytes
SHA-256: d26e4642cbd10c761c475f88429262123a389201fa311a791a4c156a054a324c
font_01_sfnt_off00007cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB1 18408 bytes
SHA-256: cd58e365bee73aaec7ca87d65418054b34927590fd48361394685267089c7c1a

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