Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba40e8bbb11ae1c9…

MALICIOUS

PDF

29.5 KB Created: 2021-07-19 17:20:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7b48feab228978c7e7d9d9d8c31ad0bb SHA-1: 7f50ab57528993e4d7d3ab5d33eea338e467bac7 SHA-256: ba40e8bbb11ae1c94bc44a1e51bdb60140468bdf281fce316b27d06816ab640b
130 Risk Score

Malware Insights

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

The PDF document contains embedded links that are identified as malicious redirectors, specifically leading to a 'free Robux generator' lure. The document body text and heuristic firings confirm the intent to trick users into visiting this malicious URL. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

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-no-verification-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_off00001e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E01 22504 bytes
SHA-256: 070ab8a74252dec68dbcd8f4c85749cab1819438989dea30aa4b205c753b0d02
font_01_sfnt_off00005016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5016 18788 bytes
SHA-256: 62238c1786e5e6676ca02185530fe02245788409f30e6753b3bb97f9a85103fa

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