Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13f666138ee8a93…

MALICIOUS

PDF

38.5 KB Created: 2021-05-13 07:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8b37e830fe6a5d6dfc5127715fa7e630 SHA-1: 393277bff575295ca3e5eed304891f2f0e846332 SHA-256: f13f666138ee8a930d6274d36684bace6b2937106bc8948d7f99eea087df0daf
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a malicious URL. This URL is flagged as a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document's structure and content strongly suggest a phishing or malware distribution attempt.

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/but-link-says-free-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
stream_003_off00003122.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3122 28968 bytes
SHA-256: 117d40dbf235bba41ee6f0c2c0a9be4d981853870d6ec0f99030b5b60e45893f
font_01_sfnt_off000073aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AA 18816 bytes
SHA-256: 8fbe90bccae9ee3155d3d967e7829d2e05c9e53767c9dd01fe36dc6e4248615b

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