Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d645c468a21b25…

MALICIOUS

PDF

44.4 KB Created: 2020-08-20 21:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07664dd76a666a3fd8d50388b265f2b3 SHA-1: 8a65575da4b57a7207eb56ad0685f44355bcc9fa SHA-256: 91d645c468a21b2527b73f24e10ebfd62b5178b3b73fc1139cdd7dc0320820f5
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational content. The ML classifier strongly indicates maliciousness, and the PDF structure includes a link farm pointing to various PDF files, many of which are hosted on potentially malicious domains. The primary malicious URL is https://ttraff.cc/pify?keyword=free+fact+and+opinion+worksheets+3rd+grade, which likely leads to further malicious content.

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.cc/pify?keyword=free+fact+and+opinion+worksheets+3rd+grade
    • http://pibeve.weldnbraze.com/uploads/1/3/1/4/131438366/letinesun.pdf
    • http://pupibam.johnbeswickfurniture.net/uploads/1/3/0/7/130775455/2605111.pdf
    • http://files.derekpublishing.co/uploads/1/3/1/4/131437670/wevit.pdf
    • http://files.tomballmemorialcheer.com/uploads/1/3/0/8/130813146/6846a2e3a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/dorinunaredobitepebobiwop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/caste_list_in_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/exercicios_de_ingles_imperative_form_6_ano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/60647981756.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/4907274743.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/18717700329.pdf
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/vefukesam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9222/files/periodic_table_of_elements_color.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/abbyy_to_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/butuxavibuxarazisub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/assertiveness_books.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_off00006daf.bin
e67fcb1b595e9afdb8e1b9a94c0cf62908a33477b102b4354aae37871c05eb9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAF 5660 bytes
font_01_sfnt_off000080fd.bin
6cf1d15517c9dbf2c36d70bf0ad9ee233f00b835a259c6d3f4a7fc3365b853b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 10456 bytes

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