Malicious PDF — malware analysis report

Static analysis result for SHA-256 7053c7e3b89794ec…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 03:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66df6ba4b26bf90edf66422ab1dd45ba SHA-1: f05199076d55de4abda83ce6bc6ebd759101b03c SHA-256: 7053c7e3b89794ec89417baf0677a437a2e3cc4a4c30f853408f25203ad88c00
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/wix?keyword=employer+response+to+employee+resign`. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and numerous other URLs, likely intended to lure the user to malicious 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.ru/wix?keyword=employer+response+to+employee+resign
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dc98cc_0a336041bcc04fa58ddbe1ec2bb83873.pdf
    • https://static.usrfiles.com/ugd/8de238_e87cc3d937af4ce38d2680c807586231.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a9fea88f0240649fe5c4050693dea6.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/62527012875.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/9757607585.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/21831750926.pdf
    • https://cdn.shopify.com/s/files/1/0448/3710/9917/files/the_horse_and_his_boy_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4a94a6ddf6d452cbc41c039b8f8e669.pdf
    • https://static.usrfiles.com/ugd/865d50_3cd6aa9e78624716a706b771a8671827.pdf
    • https://static.usrfiles.com/ugd/912de2_4c35222757e34eac9a843c8306ede738.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_82aee543f0144d58b42268e7b3f3227f.pdf
    • https://static.usrfiles.com/ugd/166c09_527fdc6eb87342f99b946dc2e420182f.pdf
    • https://static.usrfiles.com/ugd/47b1e8_eb87b93356d94e26b11512eddc848e2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_161157c80ca949628ceda4d1d843ee1f.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_off00006482.bin
244fefd205200a293ba2b496f65af70956293af6733432e1add75aadb120f634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6482 4988 bytes
font_01_sfnt_off00007574.bin
7eb8f2a8b81f043f8219cfb355080cea90b70a64ab637f0014ca8df2fd9d11c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7574 10116 bytes

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