Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf7aa7c2bd635f…

MALICIOUS

PDF

36.3 KB Created: 2021-05-23 23:04:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6b30624277b0c6021042ac8af6493d0 SHA-1: 865e046a2ab774cfc2ef5569b3e0fbe860ff2f69 SHA-256: 8bcf7aa7c2bd635f754f7a504ee7abaa97a108fd86a1b11e1a1b89bc6fe196b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection chain, likely leading to further malware download or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-verification-no-download-game-hack In PDF document text
    • http://www.niarads.com/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-free-spins-and-coins-2021_GM406889139.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
stream_002_off0000309c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309C 24880 bytes
SHA-256: 4e64bdee7371bfc97037f7c1e29a1afcb981534f2ea78e21d134394c8cc231aa
font_01_sfnt_off000069ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 19180 bytes
SHA-256: 529ad809d39cb86513f1fd0a7c59ac13158e8644a31ce1f1c8620f9d5ad40971

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