Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b37fbeaf306639…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 22:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80e5cc4c4d0715f13e95543b28842d5d SHA-1: beaa6be7c83cb0d2477ec0e61b5d6ca3bc6b34df SHA-256: 09b37fbeaf306639260fede15b0d466652041d429c0ac423b98963e58135e7d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body also contains a large number of links to various PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt to attract victims. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=yellow+rose+of+texas+sheet+music+free
    • http://files.samanthanathey.com/uploads/1/3/1/8/131856173/8277457.pdf
    • http://files.metrodetroitmun.org/uploads/1/3/1/3/131384281/239654.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/5237950427.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/phd_thesis_powerpoint_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/26177852820.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/ropugubajofolotuzeximom.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/agricultural_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/72186864023.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/35786450438.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/tukexoxebesede.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/java_graphics_programming_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/tixujilajasojafemabewafev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa6.bin
e58a5c2b1be2e82b865725e1f726c199ef4d934eed5b7bc41d7f76b995e20cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 5244 bytes
font_01_sfnt_off0000716d.bin
ca928ba1f15da0152eac06da4c0484930a9fe10dcb1d955fa00c198cf60a55a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 10504 bytes