Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b1f9a4d6e45ff4…

MALICIOUS

PDF

37.8 KB Created: 2021-05-14 21:00:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0c8f614e11df2eb73fbf9becd8cd3538 SHA-1: f2f7ddbd4c9cf1e507bdaff20af6ed54a9b9f779 SHA-256: 11b1f9a4d6e45ff4e712e419dfe7d1d6ae931cbba4d2962e949b0e126c9d08af
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 malicious redirector link, specifically advertising a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, directing users to a URL associated with malicious redirector infrastructure. This suggests the file is designed to trick users into visiting a malicious site, likely to download further malware.

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-verification-no-download-2021-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_off00003255.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3255 26116 bytes
SHA-256: a3ba7603427468ff982ff93759b0edbac4ceadb3e26353b2edb82278172d69e3
font_01_sfnt_off00006e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 19584 bytes
SHA-256: 6d060c19cfdcabcdc6bddd80792e5ccefe5b0efd90c0cd3f16f1565492dd4e8c

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