Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a57b78c8d80a15…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 09:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aeb216a9a467ec8389175934c78dc55a SHA-1: 05d7b3b10065e9f80c8341d67fa4a5b58c79c5bc SHA-256: b9a57b78c8d80a15ec2c0b81314715b85972fd593d22f6f6ffe3883e88df6b4f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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.
  • 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/master-coins-free-game-hack PDF link annotation
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://beershebaschool.edu.np/ckfinder/userfiles/files/robux-generator-no-human-verification_GM431946152.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_off000047bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BF 27700 bytes
SHA-256: 0a4d256acaf5bb634b0153a5aed764321e0e910e91163a5ac3ee063809c7e91b
font_01_sfnt_off0000879b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879B 17712 bytes
SHA-256: 91e2622ab411f5265f7b42a83c7ab878b3bc5f44429a3c49d98d87fe55e59feb

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