Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f7c3cdb93ebb29…

MALICIOUS

PDF

37.9 KB Created: 2021-05-22 21:34:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 01332c4cea05874ea7264b331ab53877 SHA-1: 4acef95602d53efeebcf39cd2a9a8d505ff99c74 SHA-256: 66f7c3cdb93ebb295fb649281645cb5d13425d77060ec76cf1920591c3cb7f92
82 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 malicious links for in-game currency or followers. The embedded URL and other extracted URLs point to domains hosting similar lures, suggesting a phishing or scam campaign. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

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/835599320/free-tiktok-followers-without-verification-game-hack PDF link annotation
    • http://www.alpaca-buitensport.nl/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-setup-a-minecraft-server-for-free_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_002_off00002ec7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EC7 25212 bytes
SHA-256: 34cfd4d9383041f06b955c5336a616e5007754f1c58137ed45077670bf850dcd
font_01_sfnt_off00006801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6801 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000071eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71EB 18560 bytes
SHA-256: 4328f2d9021fda272d6942102c30ad90396447c40598e55ae21b07e1aa723a10

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