Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f74aa9a7ec6fac…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 05:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 798b4b0549fd4a0f5d8e7f69330c3301 SHA-1: 230bb3960ad55d13c2cdbece876115a7b6ff94bb SHA-256: 86f74aa9a7ec6facec7857c1258ba74f6aaf3c6ffdd3268ec072bc436784be3d
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as download pages for game hacks or cheats. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic further supports a lure-based attack. The primary goal appears to be directing users to download potentially unwanted or malicious applications from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-promo-codes-real-game-hack PDF link annotation
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-prestonplayz-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/como-ser-hacker-en-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-hack-cleints_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/frozen-to-denth-in-roblox-games-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-2021_GM406889139.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_off00003108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3108 22520 bytes
SHA-256: 4053224c4d81eb0b98c4f5bc9210448c8c0cfcb32a7f8e1bc807dd5644c0d3c5
font_01_sfnt_off00006377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 19380 bytes
SHA-256: 9570fb6f48def72174ca281ecd176005dc9a17f232e5adac41baf8457719b8e2

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