Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914ec6f4f5a7190…

MALICIOUS

PDF

37.4 KB Created: 2021-05-25 11:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5f195f531febc02b592fa735228e9cba SHA-1: 84300c0ab85f9adcd8be1cefb90eca76f66469bb SHA-256: a914ec6f4f5a71900183f62f86e6d151c7f7fcaa45b955552e48535933933f78
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', suggesting an attempt to trick users into downloading malicious content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/how-to-get-free-robux-2021-easy-game-hack In PDF document text
    • https://www.acoustiguard.com/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://www.acoustiguard.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acoustiguard.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.acoustiguard.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://www.acoustiguard.com/images/free-spin-and-win-coin-master_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_off00003425.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3425 25876 bytes
SHA-256: 5a4ea23c763d5d27e8863e60daff174fd4f96d93573d26f405a12eb6265f9ddc
font_01_sfnt_off00006e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E16 19092 bytes
SHA-256: cc4041fc50bd2ea9a1268967e32916156e3a634973a216864dd7f220ceb04504

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