Malicious PDF — malware analysis report

Static analysis result for SHA-256 5681954fb20258ec…

MALICIOUS

PDF

40.7 KB Created: 2021-05-14 06:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9602022f3964b09733c2f16db3ea7929 SHA-1: be6f88b3deecb67a97e9c0e7c6870e623d92a5a1 SHA-256: 5681954fb20258ec8f9226d2b93f5dc2b0be0cee3d44852fd89c0ddc73e34f3c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure, specifically promoting a 'free Robux' generator. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-codes-no-verification-game-hack, is the primary indicator of this malicious lure. While no scripts were extracted, the PDF structure and link suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/free-robux-codes-no-verification-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35B2 25544 bytes
SHA-256: f93f9e69cebaf8f6a87e999d2f8a34ce98bb9eca41956bf3eb541826df9b4e2d
font_01_sfnt_off000070b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B7 3216 bytes
SHA-256: f045d428b10ef8169e7eeb86bb063aadea10192b1634c75d743109c843a748c7
font_02_sfnt_off00007bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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