Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aebffcfe9a5fd17…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 15:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d9fbfa029340bd436486bf3bdbdff5 SHA-1: 1479be3399276b22b37035e76e96ee4dace3c89b SHA-256: 6aebffcfe9a5fd17f97ce4897e6929fc5ce84cd1964b3d227648c349266e4334
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is characteristic of SEO poisoning or link farm abuse. One prominent link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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.com/wix?keyword=mies+van+der+rohe+collage
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0581/1608/files/wiwevozoloravuxulumita.pdf
    • https://cdn.shopify.com/s/files/1/0438/5410/2688/files/handout_master_1._6_crossword_puzzle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8673/3727/files/bauer_compressor_manual.pdf
    • https://static.usrfiles.com/ugd/e3834b_44f86ca6a8c54fdf8e36ade9ab80dde1.pdf
    • https://static.usrfiles.com/ugd/19103d_454cb556b71a4caa83c51806f74c0fd5.pdf
    • https://static.usrfiles.com/ugd/8e1900_d865e358e8084d5eaaef45ed4eb3cfa8.pdf
    • https://static.usrfiles.com/ugd/affaa6_439c23459e8c4c24bf8e9566d6a64726.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f430eee9e9b442993b1fc04c3d562ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d77f2b57c8a43fd8b1c7c0d218342df.pdf
    • https://static.usrfiles.com/ugd/455f95_4c9bc910389f4c7196c6903f96ce59fc.pdf
    • https://static.usrfiles.com/ugd/930050_65a11110d5124b9296d7f3c2282763f7.pdf
    • https://static.usrfiles.com/ugd/3eed2b_d51094f5815e4104a16a5510c05fc78b.pdf
    • https://static.usrfiles.com/ugd/ab059d_3c24b611cfe14815b7b7fc46f273f586.pdf
    • https://static.usrfiles.com/ugd/dd4472_60c4ba7bf11446ad94a1bf09ddffb2cf.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_9e84151dcc3b41e38b854a3bcb3ebb2c.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_off00007136.bin
b6299aaca05b03172792944710acd423593133ad13ac83ebd8e43f1a8725dd86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 5264 bytes
font_01_sfnt_off0000831f.bin
1df32834e3cd7584de5933d2e180edf910c1e09de5c18e2731157c608f5919f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831F 11476 bytes

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