Malicious PDF — malware analysis report

Static analysis result for SHA-256 faecfef170df07df…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 05:07:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d35bfbdd3df147c98ca013c455672ac SHA-1: ab325a382e5d7e92f6f83a5b090458a8bcd6092a SHA-256: faecfef170df07dfe7676d29a7145b5cd4a31f703285bd0636e9e5ef74b24de7
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely leading to the download of a second-stage payload from the embedded URL. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. No scripts were extracted, limiting the ability to determine the exact execution flow.

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/how-do-you-get-free-roebucks-game-hack
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/extra-free-spins-for-coin-master_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-33_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-roblox-codes-2021_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/was-minecraft-ever-free_GM479516143.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-ios_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/roblox-person_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-accessories-roblox_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/how-to-win-free-robux_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/coin-master-card-collection-link_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-robux-app-2021_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/hack-the-game-coin-master_GM406889139.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://elearningman4kebumen.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d00.bin
626e7f0ee944deb371e5868a15198b540cb8b547ff5e1b543f283bad456635a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D00 24276 bytes
font_01_sfnt_off000084a5.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A5 3400 bytes
font_02_sfnt_off00008fcf.bin
2ad3879de19ea59e0756335b6843f31f95ade4521f96ee42130de8f0f36df72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCF 18572 bytes

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