Malicious PDF — malware analysis report

Static analysis result for SHA-256 074348b59c4fa38b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-10 12:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c71f12dfabc014f25d3cd27a2c661df SHA-1: 80f6076a98287296cadc1910471aec90ba0ed293 SHA-256: 074348b59c4fa38b7936afd81e16d11612bc49842fa7f13ed2a97543df3fd538
194 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to improve search engine ranking for malicious content. The presence of a password-protected archive lure suggests an attempt to bypass gateway security by encrypting the actual payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=calendario+escolar+2020+y+2020+minerd+pdf
    • http://files.tcmattsandsons.com/uploads/1/3/1/4/131483282/xuzudakogufofox_midedopilu_xibenubo.pdf
    • http://xemivo.todos-juntos.net/uploads/1/3/1/4/131453045/50203.pdf
    • http://files.atmoswater.com/uploads/1/3/1/4/131407632/vimifijosojavevoxuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/sovam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/66150731712.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/44644441146.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/cities_skylines_garbage_piling_up.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/niwokedoveno.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/56645971873.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/kejulotevilinonopijesar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/coliformes_totales_en_el_agua.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/403_error_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/37145505726.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/77373293735.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/wenexusodagusiruzofotuza.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_off000068c5.bin
b57c93a114e2c5781469ad8aac247575ed82f837d5642aaf9c0af168a711c799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C5 5580 bytes
font_01_sfnt_off00007baa.bin
c324b0b360253ffea30fe0e51b5ca2ea9aca7ad3b778e314c88260ad3070db24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAA 10908 bytes

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