Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a273aee27b5ff0…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 23:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2afc1fdb22e8efec435f2adbc6ebcf SHA-1: ff21f5e40dbd894ca8a28ce91d79c97050caf066 SHA-256: 62a273aee27b5ff0a61d3043835a3dfaef3c76a9d0d4fe981b59b7ed723dbb21
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=diametro+medio+cuadratico'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests an attempt to lure users to external, potentially harmful, sites.

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/wix?keyword=diametro+medio+cuadratico
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/defcb2_a75d7660147a4f6789b0f3bbf9274c46.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cd9aa6b21b14e98aed75f44e3f86962.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d7af03a04d145f7a49d1f0b9cdc5789.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/xevitasumiregepinar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/wemugubegiloxisen.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5cbadefd1b449c8b1031826a4d9e80.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7a0b5618484dca89d0d83502fb0d85.pdf
    • https://static.usrfiles.com/ugd/b8c837_52b1f7723aae4e51b8b7a0f5db87dec4.pdf
    • https://static.usrfiles.com/ugd/0a052f_ce76b1eed56b4283bb9c62c9440c8b11.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ec84b551244b7a8abb88feec3d9f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7383c48d06cb41799bd6d22c2e475cff.pdf
    • https://static.usrfiles.com/ugd/3b7182_ea2aa2673cac42ef9d46ec15276b7df1.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_off00006d29.bin
2114b0577ce2d4c029cfd84705c5c85305aacf3c010b4aa92bcacb36252bdb0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D29 4872 bytes
font_01_sfnt_off00007da2.bin
20e79695662365ad3e0c55b43ece3294cc857d1a45078dc64000439eb98437de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA2 11252 bytes