Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a2c231cd5fb109…

MALICIOUS

PDF

35.1 KB Created: 2021-06-21 23:23:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e93ed985a684b54d7e946fe75fe7bd06 SHA-1: 73cc177adf343daec2a340033f49754cd703ab1c SHA-256: d5a2c231cd5fb109bbf103fdad37a7eea11cebcdcf6452572f83449962787a93
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are designed to appear as download pages for game cheats and hacks. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent, likely to trick users into downloading malware or engaging in other malicious activities. The presence of a 'download button' lure further supports this conclusion.

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/hackear-roblox-escape-prison-traspasar-las-paredes-game-hack PDF link annotation
    • http://zercalo.org/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-follower-tiktok-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-a-star-code-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-driveblox-unlimited-money-cheat-engine_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-outroageus-roblox-codes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/insane-jailbreak-roblox-admin-panel-hack-working_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/backpack-free-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-surveys-no-human-verification_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_off0000314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314C 22472 bytes
SHA-256: d7f72ff22de7dbf0951203807780db9d16f37884385fb5ec1ea3d7f0a2e007f8
font_01_sfnt_off00006346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 19280 bytes
SHA-256: a227d67aac0936bb0ce54a3e9c7d8998b459eced416d4763a037c657d268d748

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