Malicious PDF — malware analysis report

Static analysis result for SHA-256 053fccb6ccfb7d21…

MALICIOUS

PDF

31.8 KB Created: 2021-07-21 10:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6b9a9bc5d4206a92739e33de37d0d77a SHA-1: e87acdc2863044bd7a23ffad4bfd1f7692ac1941 SHA-256: 053fccb6ccfb7d21f57b6571e51d6d86621bb22218af9335da5a57a86de8658e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link to a site promising free Robux, a common lure for scams. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious website, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 3

  • 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/huskybucks.com-free-robux-game-hack In PDF document text
    • http://acktivities.com/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://acktivities.com/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://acktivities.com/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://acktivities.com/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://acktivities.com/images/free-robux-exe_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_off00002717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2717 22316 bytes
SHA-256: 82d6ef0fcc1157e8854b532d9eed11a89b0065ac9656210279043053af9d2efc
font_01_sfnt_off00005869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5869 18876 bytes
SHA-256: df352b193608498139f65290c43f31aa68bac06a7a86618afde903f71d2ebe9c

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