Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbfbdd8d77f5e3a…

MALICIOUS

PDF

40.1 KB Created: 2021-05-24 09:10:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 854fd711f71b3a1cbedc30737a3bc72c SHA-1: 28fd32555056e128de9ad420734e7a5190afdd74 SHA-256: 0cbfbdd8d77f5e3a346f8ee6eae83bafd4d453b4f4f673b3c6422eb058d9d1d3
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and impersonates Amazon, directing users to click a link hosted on 'netcdn.xyz'. This suggests a credential phishing or malware distribution attempt. While no scripts were extracted, the presence of external URIs and the fake CAPTCHA heuristic strongly indicate a malicious intent to trick the user into interacting with a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-no-offers-game-hack.
  • 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/free-robux-no-offers-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-windows-10-edition-unlock-full-game-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_off00003352.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3352 26212 bytes
SHA-256: 1103d4be7bd56fdcdea03b0a83cf03b921acb3b80ea0ad8b994991dd5b104653
font_01_sfnt_off00006f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2C 18012 bytes
SHA-256: db6be32425767485114cb9000642ed63280f0807e0fe45793765b8e181fce2c0

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