Malicious PDF — malware analysis report

Static analysis result for SHA-256 69da5ca948454a1d…

MALICIOUS

PDF

47.4 KB Created: 2020-08-03 21:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eb6aa42124c5cdbc364a8b78e7b1a35 SHA-1: c572bbadc11544f226eb89d8b8aaebe138b40a81 SHA-256: 69da5ca948454a1da7d8210a9fcc8853eccb008fb0bf8793d06dfa234d2bec47
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 of which point to a link farm designed to appear as search results for various documents. One prominent link directs to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness.

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=carol+of+the+bells+easy+piano+sheet+music+pdf
    • http://xazixojaj.afcptyltd.com/uploads/1/3/1/8/131856330/16dc21036171.pdf
    • http://files.explorercharters.com/uploads/1/3/1/4/131407530/zepageperubov.pdf
    • http://xupuxi.janetkozachek.net/uploads/1/3/0/7/130738732/e889935cd3a66.pdf
    • http://files.sagecrystaltraining.com/uploads/1/3/2/6/132683188/eef26.pdf
    • http://xuvuxetas.paulwoodsartist.com/uploads/1/3/0/9/130969045/ea660dbc314077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/mxr_10_band_eq_settings.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/linked_list_c_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/48152052392.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/xotava.pdf
    • https://cdn.shopify.com/s/files/1/0439/8897/5774/files/14768910666.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/70107024314.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/69617634282.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/85350320422.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/13260440589.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/40734535151.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/breakfast_smoothies_for_weight_loss.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bd.bin
cc0854f101d707c2ed8db2642a07e49b100502c842514e716f1f47081cc89eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BD 5540 bytes
font_01_sfnt_off00007769.bin
7f22fc0eb388f7ff963beb173ee241daaf6287e8f14d5920d71da4b17f6f68d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 10436 bytes
font_02_sfnt_off00009b2d.bin
d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2D 16100 bytes

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