Malicious PDF — malware analysis report

Static analysis result for SHA-256 09db4e6eb7078f54…

MALICIOUS

PDF

49.0 KB Created: 2020-07-17 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bd0907196df530dc44b8b6f5129bca SHA-1: 1b1401844e18bf28a3cd64a21a0360a0d41964e3 SHA-256: 09db4e6eb7078f54795f94e426ea8d876f1c6bfdb38fe576b819365bed173076
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, a technique often used to create SEO link farms or redirect users to malicious sites. One of the embedded links points to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the overall structure suggests a downloader or redirector campaign.

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=vaccination%20schedule%20for%20cattle%20pdf
    • http://files.jasminedanker.com/uploads/1/3/0/7/130740148/2f548e0e67.pdf
    • http://files.frontstreetfellowship.org/uploads/1/3/0/9/130969926/sowixux.pdf
    • http://files.3jtestprep.com/uploads/1/3/1/3/131398252/dbda5dee4803.pdf
    • http://files.ashleybradleyart.com/uploads/1/3/1/3/131379761/951594.pdf
    • http://files.bluethunderbirdwoman.com/uploads/1/3/0/8/130873984/tawizifikid-timib-vujululuraf.pdf
    • http://files.northwoodsbulldogs.com/uploads/1/3/2/6/132681409/moviwifemof-nutujebomuvapi-gisikuxuvewep.pdf
    • http://files.mattcarmean.com/uploads/1/3/0/7/130775536/nolanetupobibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://merujazuxidi.files.wordpress.com/2020/07/96094228342.pdf
    • https://gikifimawoz.files.wordpress.com/2020/07/1108054594.pdf
    • https://zoxazedogew.files.wordpress.com/2020/07/vegepoxinajosanimikoje.pdf
    • https://rubewutuneme.files.wordpress.com/2020/07/42538662964.pdf
    • https://jufolako.files.wordpress.com/2020/06/fedujifejofazusa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/vidinum.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/97176127641.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/rovinunulazurigakij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/lavafexidobilosesovojew.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/97190843562.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/52291777690.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/50392879365.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7113/files/83609718885.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/97637433955.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_off000080ab.bin
19dfdb38d83e0c52093c4f111efd0d5d7ce45395afb06f052203d9ed321330d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AB 5092 bytes
font_01_sfnt_off000091e8.bin
ba5b4f1660e94cc0bfda32bc5f613b4af77294769a66662aafe6cf7a34d127d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E8 10828 bytes

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