Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70e5bc3f8bd3594…

MALICIOUS

PDF

42.5 KB Created: 2020-08-16 12:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aaeac9bab767252be7f6f411f0defb4 SHA-1: 6ad69ac47f775317ab0aa20c51b1fb367de87c6f SHA-256: a70e5bc3f8bd3594951313855d270df9d686f99771e8c8fca1bf2a3d0584dc87
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One of these links, https://ttraff.cc/wb?keyword=continuous%20improvement%20adalah%20pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to malicious infrastructure. The presence of numerous links, many pointing to benign Shopify-hosted PDFs, is characteristic of SEO link farm techniques used to obscure malicious activity.

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.cc/wb?keyword=continuous%20improvement%20adalah%20pdf
    • http://files.kodzobooks.com/uploads/1/3/1/8/131871568/4783123.pdf
    • http://files.oconeebellstudios.com/uploads/1/3/1/4/131438891/rilebura.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/38419325560.pdf
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/31928242148.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/2397861972.pdf
    • https://cdn.shopify.com/s/files/1/0447/8897/3729/files/13143453902.pdf
    • https://cdn.shopify.com/s/files/1/0434/4545/2967/files/cattle_production_in_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/86124205206.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/lomiduzabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/65525239129.pdf
    • https://cdn.shopify.com/s/files/1/0434/1556/8546/files/what_guides_axonal_regeneration_in_the_pns.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a55.bin
48f8f321f20978760156241cbe09fe93d932b84151ab1f7403145deecfc19373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A55 5244 bytes
font_01_sfnt_off00007bfb.bin
23cf0d9efd2f6fdc171a36a269b555accb5db6d202d1b00b976beaadf426d984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFB 9868 bytes

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