Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1f6b83f2ef1be6…

MALICIOUS

PDF

38.8 KB Created: 2021-05-17 07:30:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a4555679b37ec324e3ccd660fdc19fa5 SHA-1: ced1988d28fdcd1669e3f18d592b5f93f99b89b4 SHA-256: 1c1f6b83f2ef1be6d1ce62f132d43fc8b8c83a3490ab145ecadbb1b6c86430a0
92 Risk Score

Malware Insights

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

The PDF document contains a prominent lure for a 'Free Robux Hack' and a call-to-action button, directing users to a suspicious URL. The document's content and heuristics suggest an attempt to trick users into visiting a potentially malicious site, possibly to download malware or engage in scams. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-hack-no-human-verification-or-survey-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
stream_003_off000032b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B2 27964 bytes
SHA-256: 1449ab0995ea124c7f18ee385cf7effb18dc8fd56f7ec4f5b83d3840ef32bf84
font_01_sfnt_off0000737f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 19324 bytes
SHA-256: 661bab6f3a048473b92ec1de100f4f76f72057f0f8e039014173720ccd048479

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