Malicious PDF — malware analysis report

Static analysis result for SHA-256 920cd4128c95c71b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 15:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b44f299f2b76e4cd95979487b8d1aa SHA-1: 1911b69c94f97ebdcfcf528ba62e2bb8104f099e SHA-256: 920cd4128c95c71b88f60b4130d4f23246667c4abd6156b59ae957659ae5a8d7
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=agilmente+estanislao+bachrach+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links, with the primary one being 'https://cdn.shopify.com/s/files/1/0431/2760/3354/files/leed_for_homes_reference_guide.pdf'. The document body is heavily obfuscated but contains the same redirector URL. This suggests the primary intent is to leverage these links for malicious redirection or SEO manipulation.

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=agilmente+estanislao+bachrach+pdf
    • http://files.boldwooddesign.com/uploads/1/3/2/7/132740764/7342566.pdf
    • http://files.driveinbiblechurch.com/uploads/1/3/1/8/131856288/vebugajuboro.pdf
    • http://files.squirrelspreschool.com/uploads/1/3/2/7/132740377/5806628.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/leed_for_homes_reference_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/kemurupopukupanopuxezezak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/kawulifemaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/jizemivamabizajenuzika.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/nimifixunezejasuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2893/files/1980_ford_f100.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/64090605543.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/97373294266.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8474/files/digital_electronics_questions_and_answers.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_off000067af.bin
dbfffa756750dad3564201801066812881ba786a7183d26bec5eb6be0009466b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 5700 bytes
font_01_sfnt_off00007ade.bin
f47820064aaf504643278d52cc0bfe55131cd3e68c55e24b9802bc8ec4e2ece4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADE 9932 bytes

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