Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9308fc9f50b350f…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 07:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4f3d3a447c8198e43e12d551cea58de SHA-1: 2d983e7e4cda441b95d93259ed385ed0b7a32d8c SHA-256: c9308fc9f50b350f98a9da55138aff8cbcc1e8ee14d378d0c81cb1328e62e9c2
170 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating a malicious redirector lure, specifically promoting a 'free generator / game hack' for Robux. It also includes a lure to install a browser extension or update, a common tactic for malware delivery or credential harvesting. The embedded URL points to known malicious infrastructure, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/how-you-get-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B7 24796 bytes
SHA-256: 983abafa22ee11550a406c387da3799e7a244fc7c26b16267870f74747abcd7f
font_01_sfnt_off00006cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 2988 bytes
SHA-256: 86c7b8e863ba3cdd86a2b7d37e0f8d61c17256aa2be4fd900a87743a1b0c58ac
font_02_sfnt_off00007707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7707 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off000083af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 18444 bytes
SHA-256: d3aeb47c5138bb2f7afdc1cd1986e008461219f841fd4d3ae6acb877e9db5a0e

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