Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9e712b6065c271…

MALICIOUS

PDF

29.1 KB Created: 2021-07-20 19:35:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 11f48b861159b88835624c18868c59c1 SHA-1: 516a4a535d31b324ca0ee5d1364fe23cf694f014 SHA-256: 4c9e712b6065c27120a975ee7d5e06eeef6d0d7a2ebaf285b1458242a7c3807a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "Free Robux Come" generator, which is a common social engineering tactic to trick users into clicking malicious links. The embedded link directs to known malicious infrastructure, indicating a phishing or scam attempt. No scripts were extracted, but the document's structure and heuristics strongly suggest a phishing attack.

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-come-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_off00002019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2019 21688 bytes
SHA-256: e56537675a7044cc06a516b2ab0437f2521d58c8b310a48ba5ae836a3e9c70a1
font_01_sfnt_off00004fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBB 18460 bytes
SHA-256: cb195acd0f31ed4642a1120884106d6d6ad37130bbbf7ac9bb6f2a8b7761ddd2

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