Malicious PDF — malware analysis report

Static analysis result for SHA-256 66df1824431f2124…

MALICIOUS

PDF

50.8 KB Created: 2020-09-01 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd13c49487fc1da593a38ecaafa671fb SHA-1: 57eae6d84d17461727d624badbed876ec1957610 SHA-256: 66df1824431f21240c72c1f881da39f19bf4b3a97548e0c401ca7889c75da836
154 Risk Score

Malware Insights

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

The PDF document contains a link disguised as a helpful guide for Excel, but it redirects to a known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.ru/wix?keyword=apply+footer+to+all+worksheets+in+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b910ae_c242f21e43f44568a4ebf7e74e6c118a.pdf
    • https://static.usrfiles.com/ugd/9c43ec_63a22375d0fd4cb3952322362d45d0c4.pdf
    • https://static.usrfiles.com/ugd/affb4a_59410d45ed04400ab2f5a5b3bcc8f528.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/cardiologia_pediatrica_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/lusewat.pdf
    • https://cdn.shopify.com/s/files/1/0437/0484/4442/files/tubeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/what_does_npi_stand_for.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/website_to_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7351/files/stomach_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/rexamaxazavizuxebabil.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/caudillismo_revolucionario.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/fke_dans_ok.pdf
    • https://static.usrfiles.com/ugd/29c71c_3200d772fa304a9abfedf066fa215eab.pdf
    • https://static.usrfiles.com/ugd/0d9a50_0e42c539dde64129a719fdde1601008b.pdf
    • https://static.usrfiles.com/ugd/4d935e_c57a77a44baf4057b0289a84de8df568.pdf
    • https://static.usrfiles.com/ugd/a838c0_02692ca8dd594e0ab3764e16be5031b2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aec.bin
cf1546990da62b57ae6d8f88fd9fd7142c70391068d86f2fd7ffae5bfffe14b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEC 5208 bytes
font_01_sfnt_off00008ca6.bin
5f2e2ef805ccda543454582c956c423b3eb5d56aa04d5eddf6978cba1a11ee6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA6 10188 bytes
font_02_sfnt_off0000af53.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 4324 bytes

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