Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fa6f1be1d91207…

MALICIOUS

PDF

39.0 KB Created: 2021-05-21 08:13:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e1da9d2290afb541d789599ac7a6c70 SHA-1: 52ee5d06f57aedb7c9e948bca62c28be6dc0281d SHA-256: c8fa6f1be1d9120750bdb5ca475445abaeb43467fcb8669f8ea39b83ce2ee23e
92 Risk Score

Malware Insights

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

The PDF document contains a link to a 'free Robux generator' which is a common lure for phishing and scamming. The document also displays a fake CAPTCHA or human verification prompt, intended to trick the user into performing an action. The embedded URL points to a suspicious domain, likely serving as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0134

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.
  • 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
  • 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/how-to-get-free-robux-website-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002ebb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EBB 27720 bytes
SHA-256: ab664908be8e700cd46675939b1fbb0b658071018eae8a08f6118c5b1e5118b9
font_01_sfnt_off00006c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C92 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7640 18600 bytes
SHA-256: ac0d4502235c23175446595a7cf8e817a77a023a22f0524dfc344b6b051bbd29

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