Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bc0c84316a09e1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-23 23:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60016c3c95a4bb8e7f4d3a6a67aa6462 SHA-1: ebc69a15c13d63cbd3f27acc26353f778c0391b6 SHA-256: e8bc0c84316a09e1f4496ce1776d197dd3dcc6723a61460469f6bdaaadb6cd64
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=connect+financial+accounting+chapter+3+answers'. The document body, though heavily obfuscated, contains text related to financial accounting and the malicious URL, suggesting a lure to trick users into clicking the link under the guise of finding answers. The file is generated by wkhtmltopdf, a tool that can be used to create PDFs from web content, further supporting the idea of a web-based lure.

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/pify?keyword=connect+financial+accounting+chapter+3+answers
    • http://rivakara.businesssolutionsbydesign.com/uploads/1/3/1/1/131163635/8644589.pdf
    • http://files.asttowing.com/uploads/1/3/1/4/131438379/lawin-rikixegowudi-kusunego.pdf
    • http://fubavata.glfenterprisesstone.com/uploads/1/3/1/1/131164406/lasodafotis_fozodopo_tinatizozatevaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/original_1830_book_of_mormon.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/72560681262.pdf
    • https://cdn.shopify.com/s/files/1/0463/3948/9953/files/47115959415.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/velotaluwodikarakipexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/67366530753.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/31018122193.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/fejajepipinajoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/15193729192.pdf
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/information_literacy_definition_government.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/mevuvef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/41869465308.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_off00006e29.bin
f998a7332374024a5944080c4bd8cebbca414b2fe986c3ac38bc8b85b2d8cc7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 5440 bytes
font_01_sfnt_off000080b1.bin
fc0847a09c0e8f39d45165409ac8cff220b935bb61a77b0fce80a8b4aac8f75f
pdf-font-stream PDF embedded font (sfnt) at offset 0x80B1 10488 bytes