Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30f1deef8876188…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 23:20:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e588030eac464d5dad91a7180b8fe157 SHA-1: 0c23701ef25f5df8cd345514763071d92e34033f SHA-256: b30f1deef8876188ac8bc78a565f279cfde4c493d169ed4cd8134f6ffd7a02ee
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with a malicious link, likely leading to a second-stage download. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for JavaScript execution to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/431946152/free-robux-gift-card-codes-2021-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-dominus-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/hack-roblox-crazy-whatever-091_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/can-i-get-free-robux-please_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/anti-ban-and-kick-cheat-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-robux-for-free-without-human-verication_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-bc-for-free-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-robux-on-a-server-roblox_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_off000031c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C7 21796 bytes
SHA-256: 12d97c52ff9599f54d8d3459d7dce3604606f1e9604302ea2ff7e13b4bc17abd
font_01_sfnt_off000061cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 19516 bytes
SHA-256: 29e75f30c5e86761bb92b3b01e6b6c9178fe3a430d56702e6e4d31a38e0984ae

Open this report in the interactive analyzer, or submit your own file for analysis.