Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ac124533b55c1c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 02:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236fee32dda38fda1bb3a91f29055bf2 SHA-1: 11ee41d573b8ea06dcd7b2a8bbd1248fa8cfff57 SHA-256: 66ac124533b55c1c60596e230d2322126125ddd3d49655c54bc8cdbe919a6164
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and a Shopify URL, suggesting a lure to external content. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to a potentially harmful site.

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.cc/pify?keyword=data+warehouse+toolkit+kimball+pdf
    • http://files.newdundeefireworks.com/uploads/1/3/1/8/131871871/2098679.pdf
    • http://files.raghuananthanarayanan.com/uploads/1/3/1/6/131636806/7710039.pdf
    • http://fasakatol.hilarymurphyphotography.com/uploads/1/3/1/3/131379678/792919.pdf
    • http://vonaseg.brian-amos.com/uploads/1/3/2/7/132741024/buwisuwol_selifozen_fitovowor.pdf
    • http://kunuruku.breedengallery.com/uploads/1/3/2/7/132740829/7213947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/toduvuxapafaburev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/canl_c4_b1_tv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8679/7213/files/african_agenda_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/sunibofavasu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5185/0655/files/java_programming_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/belud.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/javascript_ajax_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3507/files/vamedumaronelaton.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/kurojaremajiwuvuvimojozod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/77091057547.pdf
    • https://cdn.shopify.com/s/files/1/0452/4012/3552/files/13094046225.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_off00006cd7.bin
03ad9d450783092dba06d10ca36d1162224eab4d327f13aaeb8e2c400ee1c56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD7 5576 bytes
font_01_sfnt_off00007fb2.bin
c0684d6c555d527dc516588849b8284ce9ac8e0a409c49c8468db2bf454696fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB2 9956 bytes

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