Malicious PDF — malware analysis report

Static analysis result for SHA-256 1783a95848e738f6…

MALICIOUS

PDF

39.3 KB Created: 2020-07-12 12:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532f6e8493d67accfa0026a379820401 SHA-1: 669da445a2ae4413baf31d10a1a3f6e8b6f85b81 SHA-256: 1783a95848e738f650d2cd35e8d34a1c49496e79a2db80816efdc3aedea658b4
162 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to malicious redirector infrastructure and is part of a link farm, disguised as an invoice filler. The embedded document body text and extracted URLs reinforce the invoice lure. While no scripts were directly extracted, the PDF structure itself contains links that are likely intended to lead the user to malicious content.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=invoice%20pdf%20filler
    • http://files.lcisorchestra.com/uploads/1/3/0/7/130739970/dowiletamap.pdf
    • http://files.mindbodycounselingllc.com/uploads/1/3/2/7/132740294/9a8a4e95547d.pdf
    • http://files.thehistoryenvelope.com/uploads/1/3/1/4/131406075/a8d7eba46d8be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/77878396986.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/63824325606.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/zodijexedoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/52261671081.pdf
    • https://pezezej.files.wordpress.com/2020/07/4992033836.pdf
    • https://nutumomox.files.wordpress.com/2020/07/xojajuvos.pdf
    • https://vubagojexub.files.wordpress.com/2020/06/dujojatowefipoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/nevodasolesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/jogesaleloreroruserazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/72588472363.pdf
    • https://cdn.shopify.com/s/files/1/0431/0948/2658/files/13012985616.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/6009591790.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/51363663441.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_off00005edf.bin
5618d2a20195c1a66c22a8899521d2c0c5202f8ecd05d33ac89b003ac162c517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 4468 bytes
font_01_sfnt_off00006e09.bin
cca650ca50447b53af4a126d56bedf814476ebf35b68c8b632ab925474cb37d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E09 9996 bytes

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