Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5963df2389ac492…

MALICIOUS

PDF

38.6 KB Created: 2021-05-13 00:37:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 186423d4ec15378e767d8510d829ff56 SHA-1: 63913232fe82b4e0ebce531c0d833a29c19130f5 SHA-256: c5963df2389ac4923884db54a0dd762bb2fabd3be5f51a4469f3ada79580e752
170 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Robux. This is a known lure for credential phishing and potentially malware distribution. The embedded URL, https://netcdn.xyz/app/431946152/how-to-actually-get-free-robux-game-hack, is the primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest it's designed to exploit user interest in obtaining in-game currency, leading them to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-actually-get-free-robux-game-hack.
  • 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-actually-get-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003414.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3414 28224 bytes
SHA-256: 1af39f1d19e9a4624ab141ad257f206c74a1212eeedf7f7aa5f913a8200a66a5
font_01_sfnt_off000073f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 18764 bytes
SHA-256: 380379838da7ba69723634981f8e24f026256aff947d3d13a6d99450b2ab0cc3

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