Malicious PDF — malware analysis report

Static analysis result for SHA-256 90453d7d1bc549e3…

MALICIOUS

PDF

48.1 KB Created: 2020-07-31 06:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d7df11001dbbd647390adae72dde4e0 SHA-1: 286f559afb06aeaf475e082e0fa1354af2e5159d SHA-256: 90453d7d1bc549e39673c5a86e69fb69890a4b970cb611761640d443ba65d9ef
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The document body, though heavily obfuscated, contains text related to 'Mastering Bitcoin' and the wkhtmltopdf tool, suggesting a lure to download or access malicious content disguised as a free PDF. The primary malicious IOC is the redirector URL.

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.
  • 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.
  • 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://ttraff.ru/pify?keyword=mastering+bitcoin+pdf+free
    • http://files.oehlermill.org/uploads/1/3/0/8/130873875/1eda9ac.pdf
    • http://files.lebanontours.info/uploads/1/3/2/6/132681033/wexifijazama.pdf
    • http://files.guldustah.com/uploads/1/3/1/3/131383453/wajamafifebovir_pesakoxidogak.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/16234844416.pdf
    • https://cdn.shopify.com/s/files/1/0439/1459/2408/files/namawafuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/90674975882.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/bamawikoxanupusugovuse.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/63212463196.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/67201406019.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/fakupezas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/xulelij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5562/0006/files/18884045410.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/xidudebizuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2674/files/17156242870.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/rikudune.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/bamawikoxanupu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d06.bin
8f32744c4817a7fd7569732e2522c0733737c06a586295053c82f519853b077d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D06 5224 bytes
font_01_sfnt_off00008ec9.bin
b72b79836211416f6d1e1ae36c9660de6a912c06875f95b8e2670d4ed38c911f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC9 10672 bytes

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