Malicious PDF — malware analysis report

Static analysis result for SHA-256 670511f39e884d93…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 17:03:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e7a0351ee9af3e86abdc16d1a14e6c18 SHA-1: e5b8ea8ac8a95427c846505cdd7adab3818047d4 SHA-256: 670511f39e884d934f848e054ea8f23dd24ad6e923b87fd6dc33c5fb3063d518
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 0.9832

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.online/app/431946152/free-robux-no-human-verification-game-hack PDF link annotation
    • http://rkh.go.th/ckfinder/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005207.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5207 29008 bytes
SHA-256: 6c56ecd35e9720ae56b3ac0b22592a0bec18d4a982415ac976294d245e2687b4
font_01_sfnt_off000091dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 18860 bytes
SHA-256: 7bf6b254896799c3550cbaf8339a45bd8c79022df116fd793fc899e49cde55bc

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