Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fd3da884284555…

MALICIOUS

PDF

40.8 KB Created: 2021-05-21 15:46:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d46606bf79c5430a0e6f950170b56d24 SHA-1: bee931cb004b5d11a452827e545d80e7782c9f27 SHA-256: 64fd3da884284555901a9926580fe138909979c7d8e022e074e268635dd9c9c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as 'free Robux' or 'game hacks' to lure users. One prominent URL, 'https://netcdn.xyz/app/431946152/free-robux-no-survey-or-human-verification-game-hack', is identified as a malicious redirector. The document body also contains other suspicious URLs pointing to 'bufbd.org', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7499

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 https://netcdn.xyz/app/431946152/free-robux-no-survey-or-human-verification-game-hack In PDF document text
    • http://bufbd.org/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000330b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330B 27404 bytes
SHA-256: ae18aef94a2bfffd5b1f7456a304c3e047d665a0bdab516a766b8d6c47cf9af1
font_01_sfnt_off0000718e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3C 19156 bytes
SHA-256: 740843b016d65d6d98e94234348adfc338e782053996300107113ffe61ddc4f5

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