Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73b40748299a7ee…

MALICIOUS

PDF

34.5 KB Created: 2021-05-10 09:31:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 245eaa674078816248fe705c67455b50 SHA-1: 69e967fa31ff14660cfd88d1a4acc997fadfe9e6 SHA-256: f73b40748299a7ee8a80d793fe4648bcc873d57b5ecdcc82bd7269e0783104f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure, specifically a lure for a 'free generator / game hack'. The embedded URL 'https://netcdn.xyz/app/431946152/best-tricks-co-robux-game-hack' is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to redirect users to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8463

Heuristics 3

  • 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.
  • 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/best-tricks-co-robux-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
font_00_sfnt_off000031a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A6 25300 bytes
SHA-256: 0d4edca85584a69539157dd2757304d97d69c5c58d586987b0b36c5ac7553cbc
font_01_sfnt_off00006bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBB 17808 bytes
SHA-256: 372e5f4e54e44974ed9fdf545ac1dde72b995a542c6008cce17e710cf19477e0

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