Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e3020843ec8ae1…

MALICIOUS

PDF

22.3 KB Created: 2021-05-15 13:05:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5b4d563be960702e3f029746d13dac8b SHA-1: d4f2cdddf8658fd80d882843d39304eae99d4bf5 SHA-256: 65e3020843ec8ae107f9461597a7e885e076ca40e1cffa64ed589e2eeab95c7f
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a redirector lure, specifically linking to 'free Robux' content. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-com-game-hack, is identified as malicious infrastructure. While no scripts were extracted, the document's structure and the presence of a call-to-action button suggest an attempt to trick the user into navigating to the malicious URL, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0220

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-com-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
font_00_sfnt_off00000ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3 19568 bytes
SHA-256: 9f318e1c10790a830aa2e79f8aa98a3a7cf8b0174746dfdd276533ce1d60f732
font_01_sfnt_off000037f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37F5 17504 bytes
SHA-256: b9cbc25edbef69bf529a7d870e4c3a7b583f81ebd99df3ec577c453174d6d9e3

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