Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c4f0d8efb1a4f…

MALICIOUS

PDF

55.6 KB Created: 2020-08-05 02:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9481ad5a442cc8a900e3a183e4a1a4e9 SHA-1: 548e8a8ed90d7cba2709e524234f1721fee825a8 SHA-256: 3b8c4f0d8efb1a4f2f5fbdbbb47a439b42bb7d081e4e7cbc27cc2f0f1be8bc88
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=boletin+informativo+ejemplo+pdf', reinforcing the redirection attempt. The presence of numerous Shopify links, while many are benign, suggests an attempt to blend malicious links with legitimate ones.

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=boletin+informativo+ejemplo+pdf
    • http://files.tenderyearschildcarellc.com/uploads/1/3/0/9/130969932/5270271.pdf
    • http://files.drmelissacordero.com/uploads/1/3/1/4/131408353/a63f5b145973c.pdf
    • http://files.writinglifebarbaraoneil.com/uploads/1/3/1/1/131164488/nenefubiwurabuwawo.pdf
    • http://files.hbbapa.org/uploads/1/3/1/4/131408169/4c4e53.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/battery_tender_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/tefejofix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/13693740523.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/36914322469.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/58993975199.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/zebenimawopiwinewumon.pdf
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/73051150776.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70745323757.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/29389358048.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/52173689644.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/60816434022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/47887698910.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/75835457979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c57.bin
16c246275541bcbcb553495bc4b78aae7444057a7b644da1088a8dc67bf361cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 4980 bytes
font_01_sfnt_off00009d2d.bin
0df6e9828d99d91d049ad77c9b70de37cd71e9e9c3f3c408381d725c74b9a4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2D 11164 bytes
font_02_sfnt_off0000c163.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 4324 bytes