Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40c312314daab9d…

MALICIOUS

PDF

29.8 KB Created: 2021-07-20 00:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99d9212068268b961f512d4f0f93483b SHA-1: e57abaab0f5ee774fbd94bcac2d9fe266baacc58 SHA-256: b40c312314daab9d7b984e0f5357267cca78147a419b1eceaf018087f84a17ee
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a "free Robux generator" or "game hack". This lure is a common tactic for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the malicious redirector link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

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-for-kids-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_off000021a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A3 22040 bytes
SHA-256: 5c0eca4adf78e1bd6868eda11bd9fbddc687a2b91ace3ea741f14f61a042c295
font_01_sfnt_off00005274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5274 18496 bytes
SHA-256: 55df5e7c459367a60086a66aed70523cd30f2a7f5b0acb71656169eef2d04b47

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