Malicious PDF — malware analysis report

Static analysis result for SHA-256 d544525502f3d240…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 03:07:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aeaf218d44ea55c2963f3e2ab0bd836f SHA-1: 8bf87cd27226b8b873e690d95592ac19f320dccc SHA-256: d544525502f3d24017b604fe812e1f7ed7150e6bb49cde5186ef8b3c2a257e9a
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 0.9971

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/free-coin-master-spins-and-coins-game-hack PDF link annotation
    • http://librarystkippgribl.com//repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spin-and-coin-link-2021-today_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_003_off00004b02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B02 25104 bytes
SHA-256: 7b7ac147bf86c16c5edc85e17fd115546b06bd9eaf368e1898b0bbc87f47f74c
font_01_sfnt_off000084ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EC 18060 bytes
SHA-256: 55f53c4f18bfaf59a8fbb6d381f980c96a3f4ad908aa3278e43a985984e68094

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