Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5dcb21de047d19…

MALICIOUS

PDF

39.5 KB Created: 2021-06-07 06:36:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: be6a54724f42824b522770cbca98e101 SHA-1: 6740ec9c348fa059b1de929f526b8d12db13802d SHA-256: 3b5dcb21de047d1976ab31cf91b8eeb5e10b276b38365d19ead9b2419bf8ec76
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a malicious redirector link disguised as a "free generator" for Roblox games. This link leads to a fake CAPTCHA page, a common tactic to trick users into interacting with the document further, potentially leading to command execution. The document body and heuristics indicate a lure for game-related cheats, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier clean score 0.0331

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-games-free-admin-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_off00003ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AE9 27812 bytes
SHA-256: bbeb2b0d3bdc01139779cb83edeece272c80e77e681e30adc802ac3080c8f7ce
font_01_sfnt_off00007769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 18728 bytes
SHA-256: a637716af6cfe9785ac6cae2e56d8d3a568b63eaf57938648b334c373a9c939c

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