Malicious PDF — malware analysis report

Static analysis result for SHA-256 8278b3a7e905b9f3…

MALICIOUS

PDF

60.6 KB Created: 2020-09-01 08:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e649fba1d6c6952eb0d3bb73ff3c1b SHA-1: 39600a88dcce55c68fc40cfb211af157bcbbc30b SHA-256: 8278b3a7e905b9f3b17294a28eef226dc82474a951a917ee29e058b6d878e318
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/wix?keyword=entorno+laboral+saludable+pdf'. It also exhibits a high-risk heuristic for being a password-protected archive lure, suggesting it's designed to bypass gateway security by encrypting a payload. The ML classifier strongly flags this PDF as malicious, and the presence of numerous embedded links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=entorno+laboral+saludable+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/7149406898.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3831/files/22903398793.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/94762114861.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/24166846819.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/pejaxaxugomadepo.pdf
    • https://static.usrfiles.com/ugd/d4579c_96a522a6b27840c4b032bebf0215347f.pdf
    • https://static.usrfiles.com/ugd/f515ca_2be9fc4985144f21b7cef6ddd3359cf1.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_53bb41970fa74fed87b1a6387d4da263.pdf
    • https://static.usrfiles.com/ugd/1f6d71_8fe089fa9c9147f2a495b9282367551c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d956ce77f8b44fa80c665f0e1b82399.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/fopizegozemuguku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0389/files/nemavonivazi.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_off0000add0.bin
8f870704c08a7e07c436d5ae27979b3601b544484e64f7bef49a8284a5b983bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 5132 bytes
font_01_sfnt_off0000bf4a.bin
86f4139417e693e7528b668305924a2befacabb8de7ef3a2141325f400396ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4A 11308 bytes

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