Malicious PDF — malware analysis report

Static analysis result for SHA-256 0925fa21a0590f17…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 02:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a88b810b54555c2c04af5034705f955 SHA-1: d7056f73ff291031203d9942d06e87c06c0378c2 SHA-256: 0925fa21a0590f1784c215d05d2c1011e4c00c2bb759c0e8f9f0b7b257d28ea4
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.com/wix?keyword=leche+de+colores+experimento', is flagged as a known malicious redirector. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to phishing or malware distribution.

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=leche+de+colores+experimento
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_245ffa7f2bc344569f12a01034556000.pdf
    • https://static.usrfiles.com/ugd/b8c837_1120cf36c456447ea4535e950cd98174.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/83e24f_2390c802077442ff9757935f62a2a67d.pdf
    • https://static.usrfiles.com/ugd/3826db_2c180c860c6e451a8d0469bd9b47b1c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1931d8f9217245ed8e822a5bbee07de8.pdf
    • https://static.usrfiles.com/ugd/d5cf39_d2c65bb63ea14e178d0fb646759b828f.pdf
    • https://static.usrfiles.com/ugd/b8c837_754bab15c0f4436c80791f3e2f1a7b2b.pdf
    • https://static.usrfiles.com/ugd/a1fb72_dabdd51508bb4d8e91882d413a1425bf.pdf
    • https://static.usrfiles.com/ugd/67f5f7_1848adf7b97e4dd59ac57fb4e8cb37e8.pdf
    • https://cdn.shopify.com/s/files/1/0438/2513/5776/files/92840150377.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/drug_test_chain_of_custody_form.pdf
    • https://static.usrfiles.com/ugd/b8c837_d824dd26c0dd4b38ba26063f9bb9d10e.pdf
    • https://static.usrfiles.com/ugd/a107db_bf632495e36f43dc9a99a6f21d1f481e.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_off00006193.bin
7ba63a3db2a2e59c6e1b3d7ee5f8469317ac2fbd5b53f079a801e32d25f6fae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 5112 bytes
font_01_sfnt_off000072d7.bin
06b852ac15d28d58206b1dfbaebe146c5867cfee7795ec3597385c5be2fdde87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D7 11596 bytes

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