Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f931bcf2a93aff…

MALICIOUS

PDF

35.2 KB Created: 2021-06-21 22:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26337ae81a73bf23858504dd8d9635bd SHA-1: 21810ae9d85185bbae4a9f8c01052c0d00818898 SHA-256: c4f931bcf2a93afffffa776bc59f7b561fa0fc38994e24e0d3daef93e6c5458c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that mimics a guide for obtaining free in-game items, a common lure for phishing and malware distribution. The heuristic findings indicate a large number of external links, suggesting a link farm designed to direct users to potentially malicious content. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to trick users into downloading further malicious payloads.

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.co/app/431946152/how-to-get-red-valk-for-free-in-roblox-game-hack PDF link annotation
    • http://atiltd.com.tw/upload/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-sign-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-free-robux-hack-tool_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/hack-roblox-wipeout_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-free-robux-tips_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/como-hackear-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/the-underground-war-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-may-2021_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_off00003144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3144 22480 bytes
SHA-256: d0f07c1868038544958d12bf9606b9d3444dae8cd2a681790e6f46d8da97778e
font_01_sfnt_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 19396 bytes
SHA-256: 7289c5a5295d128422a47337a29e9483c0132605fbcc55854815e7c57a57ff5a

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