Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fca6124bc9f173…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 05:59:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: db827ced63bd04028251281a850fed8f SHA-1: a976ce1ec699cd36218884916c8d257daaa76a40 SHA-256: 19fca6124bc9f173bf92de78ad12e40fa842246ccdc6d08b23d37796c6b32fd0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links designed to lure users into downloading more PDF files, masquerading as 'game hacks' and 'free spins'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The primary URL, 'https://netcdn.online/app/406889139/daily-coin-master-free-spins-game-hack', is also flagged as a redirector for game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/406889139/daily-coin-master-free-spins-game-hack PDF link annotation
    • http://educhina.mn/editor/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-800-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/tiktok-free-college-books_GM835599320.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-buy-robux-for-free_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_004_off000050d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D0 25712 bytes
SHA-256: bd788d5f1f8482026d1d1c512ad8d3d8fc2b882b3034f058d5c4fd4cddf1c61a
font_01_sfnt_off00008b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7F 18308 bytes
SHA-256: 2e377c4e9f27697957871a52337602293a8911c67983c74714bc140e9d069187

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