Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a67d0c6f4491fa…

MALICIOUS

PDF

38.0 KB Created: 2021-05-19 04:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1717096c4b8f295beb61ab2049717d84 SHA-1: 06aabf154850dcceee5968f44a2b984d2deaced8 SHA-256: 87a67d0c6f4491fa0426a2e145831a2bbfeae9a2699a421ef7256801dd2c002b
130 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 redirector link, specifically pointing to a 'free Robux' generator lure. This link, https://netcdn.xyz/app/431946152/free-robux-no-apps-game-hack, is known to be associated with malicious activity. The document body also contains similar URLs and text suggesting a scam or phishing attempt. While no scripts were explicitly extracted, the nature of the redirector suggests it's designed to lead the user to a malicious site, likely for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-no-apps-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_off000036d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36D3 26020 bytes
SHA-256: 9c16edd77836c2fdd043232c6e134e2d9976a62cf4d0bce25720c2ba6cd64e34
font_01_sfnt_off00007385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7385 18192 bytes
SHA-256: dd781f2eaffddff6619a7729b763fabd5b8c4a088eef07f4c149f41bf202d502

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