Malicious PDF — malware analysis report

Static analysis result for SHA-256 767ac03680be4dde…

MALICIOUS

PDF

43.3 KB Created: 2020-09-02 11:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7cbbd91ab27e3bb4c985188a4d6d71f SHA-1: d1eccac4710b884131050ee979928a79ac86e464 SHA-256: 767ac03680be4dde4ccbb3b797ff426162b5fce09e4c2a543957ed3ca9e7e81d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'composite function worksheet with answers pdf'. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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=composite+function+worksheet+with+answers+pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/bajadasaurus_pronuspinax_scientific_reports.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/loxuzole.pdf
    • https://cdn.shopify.com/s/files/1/0439/5266/8830/files/tent_with_sewn_in_groundsheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/kozejagalel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/r_a_s_ki_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0450/9509/2376/files/discord_partner_requirements.pdf
    • https://static.usrfiles.com/ugd/4c76bf_f641cf70a2c74d89bc7020bb0e3da398.pdf
    • https://static.usrfiles.com/ugd/086daf_393af6a13cf54333a51f1abf2e1e8232.pdf
    • https://static.usrfiles.com/ugd/784815_2a0c33007d9440b19e09d2db8d47b3b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_266933efe788454c866b24dfc7a1da0f.pdf
    • https://static.usrfiles.com/ugd/d32f78_b5fc87046dd0463bb510f6b759ae20b7.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/vefujutuwan.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/pre_algebra_worksheets_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/85838152432.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/98933331875.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_off00006a6b.bin
ee8497d9a5467baf2764448b9c1993abec4950d3a95db6d481392845009c4472
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6B 5424 bytes
font_01_sfnt_off00007cc4.bin
558e72b7459c263f07466ebe2c8a34c269167cabf22d41dfd31a5fbf2b783455
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC4 10296 bytes