Malicious PDF — malware analysis report

Static analysis result for SHA-256 9245c5b7de2e8eac…

MALICIOUS

PDF

36.9 KB Created: 2020-08-27 16:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c18b8cb40a9334bc3bc00601a70aa7fd SHA-1: 09ef98b0e1e9092f8e5ed6e8b5fa84bfdb4a05b4 SHA-256: 9245c5b7de2e8eac99e4b5a33f5bc4f156e63375d07a6170273aed5fb714e531
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to lure users to malicious sites. The document body contains text related to 'marketing lamb hair mcdaniel 11th ed' and the wkhtmltopdf application, but this appears to be obfuscation for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=marketing+lamb+hair+mcdaniel+11th+ed
    • http://tadigox.nlra.org/uploads/1/3/1/4/131453133/nirulakikagepe_susepatelupi_bokobaki.pdf
    • http://files.liangflower.com/uploads/1/3/1/1/131163976/vokosisizekarake.pdf
    • http://xutewodif.lauragodfreyisaacs.com/uploads/1/3/1/0/131070786/6e7e8186.pdf
    • http://files.puzzle-pieces.org/uploads/1/3/1/6/131606284/4791720.pdf
    • https://cdn.shopify.com/s/files/1/0433/6776/0028/files/vubadibanopoxizubokeroka.pdf
    • https://cdn.shopify.com/s/files/1/0435/2956/8408/files/sefisazupudedod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/razewejufogupegofemesexil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/strength_of_materials_example_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9777/files/blossoms_of_the_savannah_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/outlook_email_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/full_form_of_all_network_protocols.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/angular_8_interview_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_off000051e2.bin
8ff050482fdd300728bff4c18f3e4afaef23c9fa543867ddc6a79609fa4abca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E2 5436 bytes
font_01_sfnt_off00006434.bin
c31341740b50bafdbcd84c1af2b844373e5e2e6448486d3a1eae9e47510f98ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6434 10192 bytes

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