Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4cf0bb448e93d9…

MALICIOUS

PDF

34.8 KB Created: 2021-05-16 05:02:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d7301bdd7da94a85579cf34d15d07976 SHA-1: a9369cf9d58942e6c9097e32de118538f42baa3c SHA-256: bb4cf0bb448e93d9f8d215c64e9b13aa5d513e561d04fdd4ca0391a9db59a1ee
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic indicating it links to a malicious redirector disguised as a 'free generator' or 'game hack'. The embedded URL, https://netcdn.xyz/app/431946152/get-free-robux-now-game-hack, is the primary lure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to trick the user into downloading a secondary malicious payload, likely via a malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 4

  • 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.
  • 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/get-free-robux-now-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_off00002f39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F39 24172 bytes
SHA-256: 6354160f9198af4e9388d3f93e7c7bf65afaaa970677f3e9d027ae0bf3a44da6
font_01_sfnt_off0000665e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665E 18280 bytes
SHA-256: 538c9dd0db01d2f7ccbac1c4b1e59781ee6b2d24c7879b3cb67aab50807a8027

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