Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81bcdc4e67a6ab7…

MALICIOUS

PDF

49.4 KB Created: 2020-08-21 01:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43239797a9638a95f848579a708dd5c3 SHA-1: ee3b3e8b5671d4d7fe12e060239657b4c6481ebf SHA-256: e81bcdc4e67a6ab704c95460ed8928c2e95d2053cebbefd023a9dc576b774a62
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 resources. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=materi+brevet+pajak+a+dan+b'. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary attack pattern involves luring users through these links to potentially malicious sites.

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=materi+brevet+pajak+a+dan+b
    • http://tefaf.joannbruhn.com/uploads/1/3/1/3/131383483/8825900.pdf
    • http://wojorowa.oldnewborrowed.com/uploads/1/3/0/8/130874655/boxuzelelumu.pdf
    • http://files.wenatcheevalleyrappellers.com/uploads/1/3/1/0/131070826/lopabivozona-nogedevuliteb-budofepegoxos-jotepiwor.pdf
    • http://files.emcspreaders.com/uploads/1/3/1/4/131455475/126335.pdf
    • http://files.sacredembodiment.net/uploads/1/3/0/7/130775853/8834011.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/algebraic_identities_class_8_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/40057547419.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/free_birthday_gift_certificate_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/47250080173.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/tofilagelo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/saxon_algebra_2_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/lapasavenotalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/add_png_to_document.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/75837073214.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/91054209524.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/8483825271.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_off000082da.bin
2464f1b1058c877cf666366be3557252b52a47454cddd8f83210c993139a164f
pdf-font-stream PDF embedded font (sfnt) at offset 0x82DA 5088 bytes
font_01_sfnt_off00009441.bin
73184b897f3db7eb5d637e5893eed41f1e1b1be9fd59bf27796e959a9d4b5c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9441 10616 bytes