Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc1ba9de839b855…

MALICIOUS

PDF

33.0 KB Created: 2020-08-30 07:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3087d49b16370f329f3fef290c24357a SHA-1: fa0a2dc00d497d6f7e494f0a6b9bb4fea775e09c SHA-256: 1cc1ba9de839b855e08649c61ad7247af9324ce5f80f3f480982966ee601acbd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, but one critical link to ttraff.ru is flagged as a malicious redirector. This suggests a link farm or SEO poisoning attack designed to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=difference+between+elastic+and+inela
    • https://static.usrfiles.com/ugd/868401_6792eff09909408aa74b0165b91faa59.pdf
    • https://static.usrfiles.com/ugd/8ab72e_171d4ea688074dc88e4e269c843a8338.pdf
    • https://static.usrfiles.com/ugd/b8c837_54eadc46311c449e81892e972544e22d.pdf
    • https://static.usrfiles.com/ugd/3f80ec_d0c919efb8cd4ea7bce685fdeaa52c51.pdf
    • https://static.usrfiles.com/ugd/b8c837_e205eb3363e2408e819946be9afc4edc.pdf
    • https://static.usrfiles.com/ugd/856cea_b922427d7bc8475fb6673e73c14a70cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_0145bf18c102466d8f84fc9a9089e9d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_af8ac3abb0b64d1993b73c35ec8d2097.pdf
    • https://static.usrfiles.com/ugd/6cf392_711177b4f24b43c79c42b9577b5cc904.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/1326356124.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/tokovafenurugafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/action_plan_template_deped.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_off000046e6.bin
a5fbec1e3355682ed847b78fb800d2b769a615e8f7dfa4b8d867af08c8b22b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46E6 5244 bytes
font_01_sfnt_off000058d6.bin
a75ab4e77d908eac1b5098076b1d534ad19337bd7c65c07fe3d5950881101f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 9012 bytes

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