Malicious PDF — malware analysis report

Static analysis result for SHA-256 77148e57d455aca7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-28 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43a4d1c27dc70973b2007c6832d31141 SHA-1: 08bca13570744c48858b39e33997628ab643a210 SHA-256: 77148e57d455aca732c7b31c7ffe1b61a29ce130c92eaa02fb003e7de40d8cfa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is `https://ttraff.cc/wix?keyword=evaluar+una+funcion+en+matlab`, which is flagged as a known malicious redirector. The document's structure and the presence of numerous links suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=evaluar+una+funcion+en+matlab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3c110e82de454fb2bef28a9e1e904a6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c66bee8f36240ab9f0693405fe6d8ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_aed81ba7b08a47d29e8023889db43d12.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/cathedral_curren_y.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/wimokaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/debukel.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ff9788c1ca747e0bfb57631ec50b7d4.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_off00007401.bin
d51130a2182091df1ce1311b53331a7b6b96877fb19eb2f760ea1140a02cc730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7401 5008 bytes
font_01_sfnt_off000084f6.bin
8db2b7f78771b3c6c4d04ff2fe1434a78819f74d17caa8ad644d482ea3ef8e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F6 11424 bytes

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