Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acce807de6c667e…

MALICIOUS

PDF

38.4 KB Created: 2021-05-11 18:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1760dd8fdccfbc161d7186dc5f40cae SHA-1: 4790bdf680b9bccb169c60b44b5129935f63ba2f SHA-256: 1acce807de6c667e711931e2e63b815f042ef72a604716b2722d47877825fcf6
132 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and impersonates Facebook, directing users to a suspicious URL. It also includes a heuristic indicating a clipboard command lure, suggesting the user might be prompted to paste commands into a shell. The embedded URL is the primary indicator of malicious intent, likely leading to credential phishing or malware download.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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-survey-or-human-verification-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-survey-or-human-verification-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_off0000360a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x360A 25712 bytes
SHA-256: fcb5c80f1c9d4183696ad858a4975c95211235a34868e617fad2578005f136ec
font_01_sfnt_off00007259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 19156 bytes
SHA-256: 740843b016d65d6d98e94234348adfc338e782053996300107113ffe61ddc4f5

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