Malicious PDF — malware analysis report

Static analysis result for SHA-256 3858c16e3d037f18…

MALICIOUS

PDF

35.1 KB Created: 2021-05-18 00:06:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f4db740c13fa58409e00dcbb850f9623 SHA-1: 1dbcb3cf3e26c4f31b18faecacbee9e02f76b8ff SHA-256: 3858c16e3d037f1837177405c6488db86f8d10444dd0f5d846ebbbe65dc725ae
170 Risk Score

Malware Insights

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

The PDF file contains a link to a malicious redirector disguised as a "free Robux generator" and presents a fake CAPTCHA to trick the user into clicking it. The embedded URL is a known malicious redirector, and the document body text reinforces the lure. While no scripts were extracted, the PDF structure and heuristics indicate a social engineering attack to drive users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000030cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30CB 24216 bytes
SHA-256: f4cd6b010cb650d631e2c1aa57f319bd842d5193682f1037a2dff80c34eca505
font_01_sfnt_off000067f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F5 18180 bytes
SHA-256: b892188b0545c7b74f3e706ff7289536b8608c6e24b963a14dda60cd6c46c02c

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