Malicious PDF — malware analysis report

Static analysis result for SHA-256 2579a5c80bcc6b01…

MALICIOUS

PDF

39.9 KB Created: 2021-05-11 21:09:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5cf9728492fadbf2fce1aab2e64ed889 SHA-1: 6c23133e8cc30174293d7bc0b30d527ea46e57a5 SHA-256: 2579a5c80bcc6b01516f91c4827396bd182565a430a4088be14a7b7316cd31f9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for a 'free Robux generator' and a prominent call to action to download, linking to known malicious redirector infrastructure. The embedded URL is a known malicious redirector, indicating a phishing or scam attempt designed to lead users to potentially harmful content. No scripts were extracted, but the PDF structure and heuristics strongly suggest a social engineering attack.

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/how-to-get-free-robux-without-human-verification-2021-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_off00003555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3555 28884 bytes
SHA-256: 936c2518955d3ffe063eaf1290653f585948b02977b14dca97ec30f54021ce09
font_01_sfnt_off00007684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7684 19792 bytes
SHA-256: 2fcc096d095577e17bc813bca386b7e419c64e6aba5a370ab2124621dd0af6c5

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