Malicious PDF — malware analysis report

Static analysis result for SHA-256 26580ddb348739a9…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 15:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769b400289ad3a9b17e9256ef9b72cd1 SHA-1: ffa6562d9e7009dcd90314dbc2707b53668080b0 SHA-256: 26580ddb348739a970695eac806470752a5571627b38a9e37d6b8118a7fb94f2
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, appears to contain text related to an 'Algebra 1 linear inequalities worksheet', likely a lure. The primary attack vector involves directing the user to the malicious URL, which is likely intended to deliver a secondary payload or phish for credentials.

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.com/wb?keyword=algebra%201%20linear%20inequalities%20worksheet
    • http://sovako.precisionofcarey.com/uploads/1/3/2/8/132815002/9264779.pdf
    • http://files.jynxmonroe.com/uploads/1/3/1/4/131453284/1003240.pdf
    • http://files.rowanwritingarts.org/uploads/1/3/1/4/131437601/151efb2d6dd.pdf
    • http://files.swampscottfootball.com/uploads/1/3/1/4/131455463/fetabafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/amartya_sen_biography.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/zogujolitetubejefisifut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/86317243962.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/60039160447.pdf
    • https://cdn.shopify.com/s/files/1/0454/5576/9758/files/answer_key_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/87963173611.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/xemuxuzazugidisefefera.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9847/files/uninstall_java_9_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/juneferuzipawugenojefizuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8112/2471/files/daewoo_g25s_forklift_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/oxford_phonics_world_1_the_alphabet_student_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/xegafonuzaxezamozuboguba.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_off00005c15.bin
20ed99a1c8f687043dab990512f181fda0c629eb89849f779d35dc7bb411aa33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C15 5408 bytes
font_01_sfnt_off00006e8c.bin
996d4a22fdb5daf9754a48ad555a16ee97d48b780ca1ce7071b99409b2ed7c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8C 14192 bytes

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