Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7e6c88a0055fd5…

MALICIOUS

PDF

31.0 KB Created: 2021-07-19 00:58:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 06a90bf2d48fbc3bc90bf0bddd841b96 SHA-1: 8be1a656f6b38417e584d599bf80b433cc0a294b SHA-256: 1f7e6c88a0055fd59062c72c16739ddd4c1a3b13173e1944dab31e210d88f082
180 Risk Score

Malware Insights

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

The PDF contains a lure for a "free Robux generator" and includes a link to known malicious redirector infrastructure. The malformed stream length and ML classifier indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to exploit vulnerabilities or redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8795

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.tw/app/431946152/free-robux-websites-that-actually-work-game-hack In PDF document text
    • https://italyfixer.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://italyfixer.com/images/minecraft-free-android_GM479516143.pdfIn 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
font_00_sfnt_off00002354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2354 21984 bytes
SHA-256: c3a321b0fa57f0abf2313e9e24ad27355746900710f0a292f9d0e22887ed14cf
font_01_sfnt_off00005423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 19440 bytes
SHA-256: 6ca5a42b15f03ce8f0527a9b99e2a0be619c538984e0635b30c2c3344ed7d0ad

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