Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff174a228c187c7…

MALICIOUS

PDF

35.6 KB Created: 2021-05-22 16:07:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b4e28013c2c8e162be45fc7fca0232a9 SHA-1: 3445e66287a9860fd1882a5a5d33c1ffb9fb96c6 SHA-256: 5ff174a228c187c725ee20777eb36d17f9a55b07962389f98e8674fb67795b65
92 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Roblox Free Robux Codes' and impersonates Microsoft, directing users to a suspicious URL. It also employs a fake CAPTCHA heuristic, indicating an attempt to trick the user into interacting with the document, likely to download a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/roblox-free-robux-codes-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/roblox-free-robux-codes-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fe2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE2 25892 bytes
SHA-256: 9ded6e6c4f4965ad6564a9481b987abc5523dc5b513115907a1f5d586876b3f7
font_01_sfnt_off00006a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 18260 bytes
SHA-256: 40a15a9049e9412bdd5c9a35f1903570ad5947e976b8939b833c9d7797e77bf9

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