Malicious PDF — malware analysis report

Static analysis result for SHA-256 87938075314d0244…

MALICIOUS

PDF

37.3 KB Created: 2021-05-13 22:51:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba4824fbf73036bcb127ce7295cbace4 SHA-1: a6c70fee8c2be8f6cfb2616971d162a814c47589 SHA-256: 87938075314d02442fe6d4b18380bee6db03d120084d37defce50a4d7f1d3bf7
170 Risk Score

Malware Insights

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

The PDF contains a lure for a 'free Roblox Executor' and a fake CAPTCHA, designed to trick the user into clicking a link. This link, 'https://netcdn.xyz/app/431946152/free-roblox-executor-no-key-game-hack', is identified as a malicious redirector. The document's structure and the presence of embedded URLs suggest an attempt to deliver a second-stage payload, likely through a drive-by download or by prompting the user to execute a downloaded file.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.xyz/app/431946152/free-roblox-executor-no-key-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
stream_003_off0000368b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x368B 25016 bytes
SHA-256: ded691862fa76434a7590b445a68cc4a42a95f9c54627d8e87963c08ca51d55b
font_01_sfnt_off00007046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 18372 bytes
SHA-256: dc47713ba6eb13f64d542fcf15a88c1c3b337790738a4cc5e94b1e08b5db33e2

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