Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d332571a3df2314…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 10:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7762334812a530dd6beb0dced8aaf9b SHA-1: 62b225da0629fba433fb19a43e55c4d1fe54a29b SHA-256: 8d332571a3df2314e8bb70008d317119fb2474fb1d444402d4fcd7448a0532d1
154 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 of which point to a link farm hosted on cdn.shopify.com. One of the primary links, https://ttraff.com/wix?keyword=long+dark+redux, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users.

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/wix?keyword=long+dark+redux
    • https://static.usrfiles.com/ugd/b8c837_14170206c1c74eaca49206bd59230354.pdf
    • https://static.usrfiles.com/ugd/ea78e0_e9fca65b6d754a6190d781cb81c686aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_04709d29d7f440bb9faddb0415b5f13f.pdf
    • https://static.usrfiles.com/ugd/c1615c_92af721235314f2fb5f7949e241d9cf3.pdf
    • https://cdn.shopify.com/s/files/1/0449/1975/0811/files/raladetonajobajewali.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/mokagurufilotaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/65356167522.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/11996933231.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/41324365174.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/naacp_harrisonburg_rockingham_branch_monica_robinson.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/68856165817.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/armchair_dwg_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/27292951468.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/50938850854.pdf
    • https://cdn.shopify.com/s/files/1/0433/8817/4497/files/jepupodipexogezamagiriga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/83822691020.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_off00006cae.bin
6fe8e5cd22b899ff66319c278a2d6c3f8df74b2697ea85521f3a5d7301ae84e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 4856 bytes
font_01_sfnt_off00007d48.bin
4c0f9155e8a56c6cfd454496a42b6b519f5c2e1c7c1b7a9417b527ed1e41c21d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D48 10596 bytes