Malicious PDF — malware analysis report

Static analysis result for SHA-256 0548299c2877b7be…

MALICIOUS

PDF

49.6 KB Created: 2020-08-21 07:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f177426c969d5c05cb0a5352bcec578 SHA-1: b3927975f55245180e6c0ca53f6842892859915c SHA-256: 0548299c2877b7be311f9c1ed90b4aec46771e9eee6345bdf0e0401fd8d7ea51
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 pointing to external PDF files hosted on various domains, which is indicative of a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=draw+something+app+answers
    • http://xuwire.sidthesasquatch.com/uploads/1/3/0/8/130874376/bibamajunerapirudak.pdf
    • http://files.visitthepreserve.com/uploads/1/3/0/9/130969548/4303425.pdf
    • http://files.ovalaboratories.studio/uploads/1/3/2/6/132681772/1f1933783460d.pdf
    • http://fogipijej.ryanglancaster.com/uploads/1/3/0/7/130776485/8623038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/nebifuwovezusorefeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/vudukakamuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/nekeveluzaroxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/25509736479.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/18018486268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/ages_and_stages_30_month.pdf
    • https://cdn.shopify.com/s/files/1/0463/4551/9261/files/hess_corp_annual_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/wubajavogavirezukeki.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/how_to_make_an_ender_portal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/blue_white_f_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7908/1894/files/zinusopejepexugikosova.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005deb.bin
abf703d972e4b4faaf9610d9c16350f6faff919dc1809ad380b8a6ab6e483399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEB 5080 bytes
font_01_sfnt_off00006f1f.bin
6bcf1f8d6951bb2794a78202a5a93177a8476dd249439610afdcbd5a0d4ee21e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1F 11444 bytes
font_02_sfnt_off00009666.bin
a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9666 16084 bytes
font_03_sfnt_off0000ab1c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1C 4324 bytes

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