Malicious PDF — malware analysis report

Static analysis result for SHA-256 67440ef97e55748a…

MALICIOUS

PDF

46.8 KB Created: 2020-08-30 00:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17312c05498831ebb633bd3a293f7db SHA-1: 1e7b69e13788421173f81a534c316992d503bd76 SHA-256: 67440ef97e55748a72f56ff1addc2ed3fa0b9aa2b27032ccab6570dbce7dad6c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.me/wix?keyword=4+bit+adder+verilog. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect the user to a harmful site, likely for malware distribution or phishing.

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.me/wix?keyword=4+bit+adder+verilog
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/como_convertir_archivos_a_word_gratis_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/gesukedutemikiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/retazufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5300/files/carrie_underwood_american_idol_finale_performance_2009.pdf
    • https://cdn.shopify.com/s/files/1/0453/9786/8712/files/lalitowalupud.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/55638886915.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/73434798782.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/kindle_app_android_epub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/3787844112.pdf
    • https://static.usrfiles.com/ugd/99afdc_c3624e09650d419e99486921596cfb1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f46307689d54debacfec8c14670a98d.pdf
    • https://static.usrfiles.com/ugd/5ad03d_b13006c6566d4861b5bda1256cc754fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_4655a326cd484d3082b8df47b7d8b63f.pdf
    • https://static.usrfiles.com/ugd/b8c837_74beb7bea6ba4e3fb1485657d6d6f66d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c817e777ffad4352919e13822e8f704a.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_off000068c3.bin
cf9f43630b07ef3c88ea2bfa29ee3be37318604077b9ec3e447b7e58e8b09f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C3 5008 bytes
font_01_sfnt_off000079d8.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D8 1800 bytes
font_02_sfnt_off00008266.bin
4fe1868377ef2642ab85f9925b996e2b3a5cc3be7d21f0d680d0c77cce372c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8266 13800 bytes

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