Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fd983e8571e524…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 03:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 849a7dda07d927d8b38d4d3520df7b3e SHA-1: d493e8fc7a41f3aed92575cd6885cfa57919bded SHA-256: 79fd983e8571e524ff7aeb7b616f0056350297c4501195ba083e79802d1be6a1
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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.me/wix?keyword=corporate+compliance+plan+template+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3150/9664/files/reneruzi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/80429587283.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/joguxadavokewivix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/72389023117.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf05ce16c7674097a1f1da5467c5178b.pdf
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/70422706670.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/lord_kinross_atatrk.pdf
    • https://static.usrfiles.com/ugd/b48b60_c08a6f1f9a36406d9451890efa5f8399.pdf
    • https://static.usrfiles.com/ugd/b8c837_510266711ea44240aaaeddf1757f5147.pdf
    • https://static.usrfiles.com/ugd/d5d855_94b2ab57d49c410a9dfef92d7a1708ee.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_off0000686b.bin
8cde49a24648f0673c7f7c9b616cfd1111b3aeaa9d14a50f4f655162f1ffb4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 4888 bytes
font_01_sfnt_off000078f5.bin
8eb8a4155be9e6754ac69cf6c3a03c9a9c870109aa4f4880cbcc66b8e091e2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 10196 bytes

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