Malicious PDF — malware analysis report

Static analysis result for SHA-256 faebc9b2f9160880…

MALICIOUS

PDF

45.2 KB Created: 2021-06-04 01:22:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b4ce2cc24e905d1ac31a3b4b361bdafe SHA-1: 62434a87bbcaa770e0700ef75d2ff283ff8ed250 SHA-256: faebc9b2f9160880a7d78fc4247c15485df41043733f7e423114cf491d00d198
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are structured as SEO link farms. The primary lure appears to be 'free generator / game hack' content, directing users to URLs like https://netcdn.online/app/406889139/free-links-coin-master-game-hack. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a visual download button further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/free-links-coin-master-game-hack PDF link annotation
    • http://lib.mbp.ac.id/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D50 24748 bytes
SHA-256: 4ac32dfe8d25540ef845160600fa55e985dc5b15d6d1d1525dd886e1c12ddfc0
font_01_sfnt_off0000854b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854B 2884 bytes
SHA-256: b24d7d1c6a3ff51682c9b767bd6e17ba5306dc0dcca4b7eb31f6431f0793c6d6
font_02_sfnt_off00008f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2B 17880 bytes
SHA-256: c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc

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