Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a5b6716b4041e6…

MALICIOUS

PDF

35.3 KB Created: 2021-05-10 12:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: efd21d62f23cf0795ea163c302d8b6a4 SHA-1: c0942e8a3828acd33cc060574a89d4832f63e9a4 SHA-256: d3a5b6716b4041e690a2d3450b875288a18716450e4a275201f82557de18c6b9
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/www-rubux-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/www-rubux-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324E 24072 bytes
SHA-256: 5eb6ebd408340dc00801bd5bfe91667606c696ff6b9acaa94849b01362323f01
font_01_sfnt_off00006929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 18068 bytes
SHA-256: fc38c016acc36c76b7a0729eb2c8d98b0fd59e97c8a3cfb4a698daadf76a8d1e

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