Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b3a8e23ab87a91…

MALICIOUS

PDF

36.7 KB Created: 2020-07-30 12:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe24828c4f9f73f268ab681775d632a7 SHA-1: 4f8ed17279c388edb4ea1e1f6b12f882344a713a SHA-256: 45b3a8e23ab87a9186d78ac85b392961cf4f62dd5236f8ee4200ebd8a145b7c2
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to improve search engine ranking for malicious content. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation or to host malicious links.

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=cantoral+liturgico+nacional+mexico+pdf
    • http://files.reedcusterband.com/uploads/1/3/1/1/131163666/de656b5cb928d.pdf
    • http://files.almosthomecaninerescue.com/uploads/1/3/1/4/131453267/63448b4ff.pdf
    • http://files.chickadeecanvasdesigns.com/uploads/1/3/1/6/131606347/jupuwujilumaxow.pdf
    • http://files.childrensfocusfoundation.org/uploads/1/3/2/6/132695492/1433376.pdf
    • http://files.ch
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/foxomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4817/2710/files/rovowubeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/8872/4639/files/56538619903.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/monuzixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/52681330903.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/26765473077.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/59435589786.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/28260088429.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/tubajejotamowuzosuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/99998153934.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/vikonon.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_off000053da.bin
ca7eef16fb5b7847a5abd573a799e32421e02aa61ae2781350961144853dfe26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DA 5268 bytes
font_01_sfnt_off000065b0.bin
9d65b33b26d0c75ac6dc904a5e64ac0ebaa7f673c6dd9814176c0684b9b27fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 9296 bytes

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