Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e72889eab80b475…

MALICIOUS

PDF

38.4 KB Created: 2021-05-17 06:02:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 38d5a58a0e04c35279b72fd41523b314 SHA-1: 0aa2594bae1331f0d01e6da2cd2c2c5235ea56c3 SHA-256: 3e72889eab80b475370a8282b2dd0ceb7a25fc947a1c2eed920d21c3df7a3439
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a lure for game hacks and links to known malicious redirector infrastructure. The embedded URL, https://netcdn.xyz/app/431946152/earn-free-robux-today-game-hack, is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to a potentially harmful website, likely for phishing or malware distribution.

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/earn-free-robux-today-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_off000035f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35F2 26248 bytes
SHA-256: 32b0aa4365c6143f18eb03fa99d86e7d596bc102559eab15af42975eb0985d2f
font_01_sfnt_off000073f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 18596 bytes
SHA-256: 856adb635f1df42b1ab7aec7f905735c2cb2dfebd4088312a1c80dc48447787c

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