Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7a9587185d37a1…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 06:20:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e7822caed76f42c8e913455f261b0981 SHA-1: f32d3936bec6072b4092483e3147ebb3f48918b0 SHA-256: ac7a9587185d37a1e0a247165527eece70109b62fc3dec4e6e01ea884e5cdd74
162 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior by presenting itself as a lure for game-related cheats and downloads, indicated by the 'SE_SECRET_RECOVERY_LURE' and 'SE_DOWNLOAD_BUTTON' heuristics. It contains numerous links to external PDF files, likely part of a link farm designed to distribute malware or phishing content. The primary URL, 'https://netcdn.tw/app/431946152/hack-roblox-counter-blox-download-game-hack', suggests a direct attempt to trick users into downloading a malicious payload.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.tw/app/431946152/hack-roblox-counter-blox-download-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-iphone_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_off00004f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1B 24196 bytes
SHA-256: 38a7aa9e6ca203256394ad03225029febbffe1c1cad5eda2c06881ee20458a41
font_01_sfnt_off0000868c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868C 18932 bytes
SHA-256: d22eb10363824204823441bee25d59d4fcbf66103b00324b83316a956174ed56

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