Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1c9e8d56350ed9…

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 19:17:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a0564a27fe90029bfa4e5b2b877d8b0f SHA-1: 32287d016adc4de4f6246e3a98b88d52d12194dc SHA-256: 3a1c9e8d56350ed94099677854bf2d0d1282ffbee9a1ae8391e683093ea4363f
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds external URIs, such as https://netcdn.xyz/app/431946152/what-is-a-robux-game-hack, which likely lead to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious with a high confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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 https://netcdn.xyz/app/431946152/what-is-a-robux-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/robux-without-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/moon-active-games_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/moonactive-coin-master_GM406889139.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_003_off00004836.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4836 25480 bytes
SHA-256: 4a67e4faca36e72a8d3950cb825c8da0d51e7e1d0be35e2d2a7fb3bc01b601f1
font_01_sfnt_off000082fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FB 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA3 18548 bytes
SHA-256: 3316b7a4d548223335f333f1efaf0184c5ffecf7c7bacabb6dd9a6d8e3ca5dd1

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