Malicious PDF — malware analysis report

Static analysis result for SHA-256 31551ed5b48a79e6…

MALICIOUS

PDF

37.8 KB Created: 2021-05-24 05:44:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 59cff68760c25e7c060cf773f3ba1f0a SHA-1: 7afe997ebba68fbe8755ac2ab379483e47957e8f SHA-256: 31551ed5b48a79e64a0178689f6fb316d088cc6586b2d17e4f4bf0f17fbb96ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious infrastructure, specifically advertising 'free Robux' or 'game hacks'. The document body and heuristics indicate a lure to trick users into clicking these links, which likely leads to a phishing site or a download of further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/is-there-a-way-to-get-free-robux-game-hack In PDF document text
    • https://www.interfaceventos.com.br/imagens/files/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://www.interfaceventos.com.br/imagens/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.interfaceventos.com.br/imagens/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.interfaceventos.com.br/imagens/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.interfaceventos.com.br/imagens/files/coin-master-free-spins-link-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
font_00_sfnt_off00003488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3488 26636 bytes
SHA-256: c24bc91743fa6308345566de5ffa8c832a6eeac91971cf0799d0be6c278f9cbf
font_01_sfnt_off000070cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CC 18892 bytes
SHA-256: e2ca2daecae93cd27ff1d51a172310d30bada5b25af9f9600d3ad780ee102f76

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