Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e50bfe9f1a078d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 06:45:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6b6777610e3e6bb28f1b1223aa93d5cd SHA-1: 1bf1df3e3a73a0f9ced6efb22f057864b8e2dab9 SHA-256: 49e50bfe9f1a078d47c2d66ab9d2ecda392fa6b7a295a7c0b42ce4121af62775
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'game hacks' and 'free currency' to entice users. It contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents, suggesting a link farm or redirector for potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for linking to game hack sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-make-a-skin-in-roblox-for-free-game-hack PDF link annotation
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/increase-speed-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/kristjonz-15k-robux-reward-hack-tutorial_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/legends-of-speed-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-rap-lyrics-for-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-promo-code-hack-script_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
font_00_sfnt_off00003187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3187 22448 bytes
SHA-256: 997e2b35638ec59506b9ec7a1ea455ddfda9ae789cb94f23ef6352d4bc5d492e
font_01_sfnt_off00006353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 19300 bytes
SHA-256: 134f3d9134601ac268df98f82f82296e43f40fbd599c300777f0a07ce33d0eab

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