Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5db770d03ef754…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 21:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa5b8e307da00bf55a5a2f773c701a8 SHA-1: 797b1717d287cfad697f73ce34cf72d93a08e348 SHA-256: 6f5db770d03ef75407bd49bdd68599c7fbdd8deb815b7b1b4c17e38b63dad52d
162 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 document body, though partially corrupted, suggests a lure related to form filling. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many pointing to PDF files, suggests a link farm or distribution mechanism.

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.ru/pify?keyword=mht+cet+2019+option+form+filling
    • http://files.aginestra-design.com/uploads/1/3/1/3/131380850/6105392.pdf
    • http://files.stuartestates.com/uploads/1/3/2/6/132695575/cf934460095.pdf
    • http://retanufaw.kmcrisisministry.org/uploads/1/3/0/8/130874493/3691272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/intro_stats_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/15185006761.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/gasukodoxobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/jekafodezegexaxopatejebup.pdf
    • https://cdn.shopify.com/s/files/1/0436/6041/1033/files/84558347827.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/wazoxabipulonijixofuva.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/madukuwonimaripemane.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/incili_gastronomi_rehberi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4399/5298/files/2879402646.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/73403958490.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/94673528897.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_off00006046.bin
1655ac68a759be219e69447d483b9b8fd2767c8ae10eedd3245dac1cf61ba2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6046 5528 bytes
font_01_sfnt_off00007300.bin
42a3a82658182bbae8a064802b08d904b1d6129972bb0341563c8849a3652d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 10708 bytes

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