Malicious PDF — malware analysis report

Static analysis result for SHA-256 19548b722e2e6b29…

MALICIOUS

PDF

37.1 KB Created: 2021-05-12 06:48:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 767965312c457698fb6675e504b1af40 SHA-1: 30015f19998af28239dabe1f78f199d08f1d72a3 SHA-256: 19548b722e2e6b29bd98e2b67066fc3d33c9ddf07a9fe2d21a04e244a0fb4364
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'free generator' or 'game hack'. The document body text and heuristic firings strongly indicate a social engineering lure designed to trick users into clicking the malicious URL, likely to download a second-stage payload. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/get-free-robux-no-verification-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_off00003326.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3326 25524 bytes
SHA-256: faddcab6d56461c2cb7c866f6de03ca347e8d4cf65fb16e73be7e3e98a0f7274
font_01_sfnt_off00006e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 18600 bytes
SHA-256: 9922d9be899d889309b30d551f0ca0ad5440aa2f545e895e218caf9f3be39a86

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