Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3ad749d2ba483c…

MALICIOUS

PDF

42.3 KB Created: 2021-06-09 03:20:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1738e0d374c2326c0058b1147e30ab84 SHA-1: 8c504d7a5a776437a3f351938a11b25dd441d3b8 SHA-256: 5c3ad749d2ba483c7a69a6d72ff46277dba9a1adfbc0addd8a5612a11c65a3db
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL, https://netcdn.tw/app/431946152/glitch-to-get-free-robux-2021-game-hack, is associated with malicious redirector infrastructure. The document body also contains text and links reinforcing this lure, suggesting an attempt to trick users into visiting a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0284

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.tw/app/431946152/glitch-to-get-free-robux-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B0C 26888 bytes
SHA-256: b20c1fb7798a51b326f6239464bcbc494d2c68b7aadbbe989c547cedeb13db6a
font_01_sfnt_off000077d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D4 2920 bytes
SHA-256: 44788e4cedabc7e030d7cef5410c7f71146b1d44f4d1eb58a5000d3755917c6b
font_02_sfnt_off000081ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 18880 bytes
SHA-256: 11f0819b8ff1069104b34f61873642a115162aac0ff7b8442a2f6c1cf905faf9

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