Malicious PDF — malware analysis report

Static analysis result for SHA-256 c351638df9258264…

MALICIOUS

PDF

43.6 KB Created: 2020-09-01 03:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca76a0ce2c16cb404f6ce40078a9845 SHA-1: 2544a5e409022f9845dc1ad8a9f5c669db0b6641 SHA-256: c351638df92582642df8674b69941847352b15b4045059adeb0a2fe2567f5135
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 of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=benefits+of+bilingualism+in+early+childhood+pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/1800987735.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/tsunami_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/sunufosekuzopapaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/jimijedisafadeviru.pdf
    • https://static.usrfiles.com/ugd/b8c837_32307e46f22b4d13a12dade640d34f83.pdf
    • https://static.usrfiles.com/ugd/5b9a87_dc241778edc34aacae95544535e3320d.pdf
    • https://static.usrfiles.com/ugd/b8c837_732c8368196a49a786400635c98f5a6e.pdf
    • https://static.usrfiles.com/ugd/ce5d00_20ed9df40ee54fa5b2f2c7247ef344ee.pdf
    • https://static.usrfiles.com/ugd/122077_99177f2f76c048edb874ebabc579d2f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3009db3f9801433da76a57a9ab8f5326.pdf
    • https://static.usrfiles.com/ugd/b7ab08_e69859e2843e45b28c4bdc6493737a8f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/panasonic_ag_ux180_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/8722/4993/files/94882984381.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_off00006a69.bin
e7ca1d30885dfd09248886eea73b9390df456752428d239f44291919e0e51c44
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 5860 bytes
font_01_sfnt_off00007e3c.bin
577f45ce03007eef811d68ff94bfa0bab9dbc68f6084558eb0f4b486be1d0d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3C 10532 bytes