Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae78e33a553b7380…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 12:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee03e46a99c385c0e08d066866ea733b SHA-1: 1093845293ebcc327ef345d45a6e47c20edf7ea2 SHA-256: ae78e33a553b7380b324b0a2ccd98c4571aaee2fb87d12fad9241eef3ff1efbd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links and a primary URL pointing to a 'free Robux gift card generator' which is a common lure for downloading malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm designed to attract users searching for game-related cheats or free currency. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-gift-card-generator-game-hack PDF link annotation
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-roblox-with-notepad_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/best-free-masks-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-hack-20210-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-gameplay-no-download_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-generator-2021-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-access-code_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-restraunt-tycoon_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/get-real-robux-for-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/robuxin-robux-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-apex-spice_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-100-robux_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_off00002f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F05 22664 bytes
SHA-256: 1087c6662e656d6dbe7a906aa43b8470efa58c29dd27050030f0f2d77270e87e
font_01_sfnt_off000061a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 19112 bytes
SHA-256: da31b86bd70513bc950f6f3ebef22a0e782d6f2bb4858530ba27cd7b56ad3104

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