Malicious PDF — malware analysis report

Static analysis result for SHA-256 7851750e55ab19f4…

MALICIOUS

PDF

29.7 KB Created: 2021-07-19 14:50:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5916b260eacc22ae84b02158ecf8d089 SHA-1: 6f2d4a1200aa87fcea8452af6fadce9f20124fcf SHA-256: 7851750e55ab19f4e6171c8b2d2624bd3e45fc8772f7feedcc91bce88624811a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text that lure the user with "Free Robux" and a "ROBUX GENERATOR" to encourage clicks. The primary link directs to a known malicious redirector infrastructure, indicating a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

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 http://netcdn.tw/app/431946152/free-robux-promo-codes-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_off00001e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E34 22780 bytes
SHA-256: edf01f6ad93f9b2b074fafdbbfd15ba986ba7bae36056badbb610e82b69dfe82
font_01_sfnt_off000050fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50FE 18788 bytes
SHA-256: 0e55ae72b0ffc5c36079d000a2aced7cb6ea96947dc8c7621091f09423c55b10

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