Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b8c7dd68cc4b87…

MALICIOUS

PDF

30.7 KB Created: 2021-07-19 02:13:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b6a62f431e9d4468503f7653836c1c3 SHA-1: 92f6151c3790c69cf0e3e3fa304734e175b719dc SHA-256: 89b8c7dd68cc4b876dbc3c72a3a2b739c7148375e7c0acb08a9a56d8d10fd2d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting a "free Robux generator" lure. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9540

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/how-to-get-free-robux-game-hack In PDF document text
    • http://news123.it/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://news123.it/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://news123.it/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://news123.it/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://news123.it/images/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://news123.it/images/how-to-get-free-robux-hack_GM431946152.pdfIn 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_off00002482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2482 22112 bytes
SHA-256: 7d7691011b90ac21b71d12d03da476bd71b820ac4bfedafae2e02db99a417bb7
font_01_sfnt_off0000558d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x558D 18468 bytes
SHA-256: bfd0bb3e535f31ad3dec3a4faa455a2d823d510b4f27f0e8fabe0982a1b88800

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