Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8c7b70f05a8ce3…

MALICIOUS

PDF

29.0 KB Created: 2021-07-19 00:05:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d8a0c0057a598ea0de8778eb222ebc7 SHA-1: 06186d7cd91833bf94b2016b346ce69c60e6be63 SHA-256: 3c8c7b70f05a8ce35da6bc9ba48fad12beedeec1f1b4ced8dfc1c45496203057
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "Free Robux Quiz" and "game hack", directing users to a known malicious redirector URL. The document body explicitly contains the text "CLICK HERE TO ACCESS ROBUX GENERATOR", reinforcing the social engineering aspect. While no scripts were extracted, the presence of malicious redirector links and the lure strongly suggest an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0570

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-quiz-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_off00001d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D08 22364 bytes
SHA-256: be51b88de911388aaebafc07b51e84130ac84b28a33792af4fe361826ec076e5
font_01_sfnt_off00004ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED9 18560 bytes
SHA-256: be8fcce7c5e8f21549de4f14d1ba57ce7d27096593ae719034b880f2108d8a25

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