Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58f738b74facd89…

MALICIOUS

PDF

43.4 KB Created: 2020-07-09 19:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 09455b0d45b62bea57c90d8ab2b620f7 SHA-1: cafe973d7e20c75a66c72b537c73dd8a23ccc551 SHA-256: c58f738b74facd8989d3a85b83f87ef9849177b6c188d5bd46b6636188b50562
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, though obfuscated, contains references to a book and URLs, suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a phishing or redirection attempt.

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.com/wb?keyword=kingdom%20animalia%20book%20pdf
    • http://files.bayareaindustrialland.com/uploads/1/3/0/7/130739343/dudativa.pdf
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdf
    • http://files.tweedsalonspa.com/uploads/1/3/1/6/131636972/1135ad83b455d4d.pdf
    • http://files.lwvmadampresident.com/uploads/1/3/1/6/131637701/nupimomud-timidemebulume.pdf
    • http://files.kireilifetherapy.com/uploads/1/3/0/7/130775652/7120309.pdf
    • http://files.sapphirejamelia.com/uploads/1/3/2/8/132815742/vumamozumig_nawurere.pdf
    • http://files.thecryptocorp.com/uploads/1/3/1/4/131409244/wizejuraxavu.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.davidsalter.net/uploads/1/3/0/7/130738806/ruvageravaw_goboxi_lusujigajumuga_nifetotagug.pdf
    • https://wekogutew.files.wordpress.com/2020/06/82023013385.pdf
    • https://dokowigi.files.wordpress.com/2020/06/selizupiregur.pdf
    • https://xituvodewam.files.wordpress.com/2020/06/61512382250.pdf
    • https://vimenemuzez.files.wordpress.com/2020/06/godekiwevilef.pdf
    • https://tasazobobeg.files.wordpress.com/2020/07/towotapawosezomuzulaveput.pdf
    • https://merujazuxidi.files.wordpress.com/2020/07/midemekapopotakisexasotaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dokole.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c16.bin
9ad0c1faa862f0b73894cf36e9ffba03452b441f277e06ca00b5b18c53d81780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 4848 bytes
font_01_sfnt_off00007c63.bin
4c03eecf7b15b099201d9bb483b7679535cab7a2fbb779f2e5d5f64f375f7d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C63 10568 bytes

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