Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6d8b6ace6b7df…

MALICIOUS

PDF

50.0 KB Created: 2021-06-03 07:37:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5c096d1b04494504defed6809625bf24 SHA-1: f80a13e260f54da9754c9908f96f07861bbb706b SHA-256: a4c6d8b6ace6b7dfeeee1730ac2fda6a968108be7bed29d0e3309e38c2375fbf
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The document employs social engineering tactics, presenting a fake CAPTCHA and a browser extension installation lure to trick users into executing malicious content. It contains multiple embedded URLs pointing to potentially malicious download sites, suggesting it acts as a downloader for further malware. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.online/app/431946152/cheat-engine-bypass-roblox-download-game-hack PDF link annotation
    • https://fridaytravelnepal.com/userfiles/files/roblox-imagine_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-java-free-account_GM479516143.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_off000055dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55DD 25116 bytes
SHA-256: 540e2f41b44524b9447edcf50fbacbfaf3a1f84954e8a105d48ee1b4f1431b7a
font_01_sfnt_off00009039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE0 19552 bytes
SHA-256: 5a1c93b15a277fc45f1e84f43a90b335ad0ff137842697b8259787270c2c2d1c

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