Malicious PDF — malware analysis report

Static analysis result for SHA-256 714e8a877b06250c…

MALICIOUS

PDF

47.8 KB Created: 2021-06-07 00:45:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e886a12f684e56a12f02cc550e79363 SHA-1: 1e022a58992877bc206c8963b9558592a34258f4 SHA-256: 714e8a877b06250c9aab8050c8b72801ffcca133476533ad91d497fa30debb0e
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into clicking on numerous embedded links. These links, such as 'https://netcdn.tw/app/431946152/free-roblox-cinema-4d-rig-game-hack' and various URLs hosted on 'zercalo.org', likely lead to the download of further malicious content. The high ML classifier score and the presence of a link farm further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-roblox-cinema-4d-rig-game-hack PDF link annotation
    • http://zercalo.org/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF3 26064 bytes
SHA-256: 15d60451e7e746f90791bb861c10b794e72e9428922a2827daa3aef28f1081fb
font_01_sfnt_off00008c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off000095ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95CA 19080 bytes
SHA-256: 92d1105813cce0dce18ae585bfb39a51d987d580658bd84943efc05aa84b87ba

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