Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1e3d6e35ec9d34…

MALICIOUS

PDF

35.9 KB Created: 2020-08-31 20:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3cb1898ec676e9f0ab70f954d97aed SHA-1: d01b2c1394323fac0492d89308366d0b793d2041 SHA-256: 1c1e3d6e35ec9d34f27a966dc8dbdc2d455a0626b6d1e2b000953dc20514c553
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that lead to a redirector URL, disguised as a 'dinner invitation templates free' lure. The primary heuristic indicates a malicious redirector, and the ML classifier strongly supports this finding. The document body, though heavily obfuscated, contains the same lure text and URLs found in the heuristics, reinforcing the social engineering aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=dinner+invitation+templates+free
    • https://cdn.shopify.com/s/files/1/0432/0418/2173/files/momonojukajaruduwudi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/tebosexukogedigowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/8520874287.pdf
    • https://static.usrfiles.com/ugd/804ff6_278390c9f0474da9a4f1a23f3eba7f45.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_ea40668197b848548b7328fcd1de10d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_113ebf78a3324752a355d55de411a222.pdf
    • https://static.usrfiles.com/ugd/0cd019_c0c51fa173574cf2b2bf6749be1ecedf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/herbal_treatment_of_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/piwivibadujikubaxiragof.pdf
    • https://static.usrfiles.com/ugd/b8c837_0990046c9ea74b949eaad5d8f831e0b0.pdf
    • https://static.usrfiles.com/ugd/e8506d_0f1464b8bdb44e5ab7e196d3f9a31ab9.pdf
    • https://static.usrfiles.com/ugd/b8c837_36333086043b4e07be6b7cde5fc459aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8a1315913324db58de1abe100be3bfd.pdf
    • https://static.usrfiles.com/ugd/6f7357_dc58562cb35f4a7f858c03ea3eb5f3e6.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f1.bin
ccbeedfed81e181f725439940c93529bd76b58468d933bc134a20d7782da7d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F1 5108 bytes
font_01_sfnt_off00006243.bin
19864233710866d71a804f6d82af696f068b1d3d5dc9fa6f89388a2080c33471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 9500 bytes

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