Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b906b585e355e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 19:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea911b2ea16a32fe84b1200fbfc55d37 SHA-1: 56404f3d40178bebcbbb826a5095c7fa7f6ead74 SHA-256: 731b906b585e355e27d0210ec51fede6dfb607b035c690cf39dbe8347b986c27
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 pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also hosts a large number of external links, many pointing to Shopify domains, which is indicative of a link farm SEO tactic. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=formule%20rubik
    • http://files.revlyncox.com/uploads/1/3/1/3/131398555/4668223.pdf
    • http://files.coastnuflow.com.au/uploads/1/3/1/6/131636990/doxotulifuvaloxadumi.pdf
    • http://files.crgddl.com/uploads/1/3/0/8/130814245/da98e90f8da510a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/street_addresses_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/hexadecimal_addition_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/38201490436.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1106/files/34131398750.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/jivisaxibuzuvigepewese.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/9326143507.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4379/files/nidorino_gen_3_learnset.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/nonezuzapefixuzezirameb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/financial_accounting_for_undergraduates_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/40607258793.pdf
    • https://cdn.shopify.com/s/files/1/0448/6764/9698/files/splwow64._exe_appcrash.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/sefos.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_off00006221.bin
d2962c06a1b77d824fc3c02e96d38f957e24efc41231b62787b6b155ddfb03b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5484 bytes
font_01_sfnt_off000074c2.bin
85b4c22c7974b7560d3c5ed5c7748aa42335cb669f540aef7dadad0e6589bae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C2 10184 bytes