Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc31a1c6c2cbbc0d…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 17:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 02fa59aa341d151fa403169c1a655965 SHA-1: 797fec0c60247067bffc1c6dc6984e2d0e3f2d3f SHA-256: fc31a1c6c2cbbc0d7ce628c10ca274fa1593286f3d60c262587dd04dcf30008c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-verification-game-hack, is associated with malicious redirector infrastructure. The document body and metadata also contain references to this lure, suggesting a social engineering attempt to drive traffic to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/how-to-get-free-robux-without-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_off0000347e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347E 26848 bytes
SHA-256: 901252ee256941abf4059960a71431fede848e19f595efd6cab5fe9bd860f429
font_01_sfnt_off000072e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 19128 bytes
SHA-256: fe2fba94a2d86c9c71a87afecb14f9f9cb432365285dbf62d8027955010708b1

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