Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ed436a141cf745…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 05:10:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: eaac330186cea557079cad4aa132d685 SHA-1: 94e84b1da940a8aac636d19298b9f984ac90fb1f SHA-256: 85ed436a141cf745732bcb37bb20e375c18085e3125f5358d7c07caaeeafddba
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of 'free Robux' and game hacks to entice users to click on external links. The document contains a large number of these links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, http://netcdn.tw/app/431946152/earn-robux-online-game-hack, likely serves as a redirector to malicious content or further phishing pages.

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.tw/app/431946152/earn-robux-online-game-hack PDF link annotation
    • http://digilib.akperkabpurworejo.ac.id/repository/omg-this-worked-how-to-get-1-million-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-account-hack-app_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-cheat-in-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/hack-roblox-pour-les-simulator_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-hack-a-game-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/roblox-hack-explot_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/roblox-tower-battles-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/free-rixty-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-download-free-microsoft_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/mad-city-roblox-cheat-synapse_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/is-a-hacker-really-putting-inappropriate-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/robux-hack-tutorial_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://digilib.akperkabpurworejo.ac.id/repository/roblox-account-hacked-ebay_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_off00003198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3198 21892 bytes
SHA-256: 725ecd274a19c0baa4517502e8c4a042d34fecd7347e2baae8171f53a6392340
font_01_sfnt_off000061c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C5 18744 bytes
SHA-256: cacdbe3b2c8def67201ad09f0e8737d99eb038cf9c260e0820846d3ceea07437

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