Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e4337a01d78c19…

MALICIOUS

PDF

32.4 KB Created: 2020-09-01 20:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243478b7b4580d0d45a9e55d05f50b35 SHA-1: da105fe0160c3aa2b72cf40bbb7f447530009423 SHA-256: 93e4337a01d78c1989eff92f88054e424bdaf5f3bc0fa0c7e703a9ee3fd873f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'soft bait sds sheet' and includes the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly indicates 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.cc/wix?keyword=first+strike+soft+bait+sds+sheet
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/35769234352.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/kannada_barakhadi_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/punctuation_rules_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/59184871905.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/42264740778.pdf
    • https://static.usrfiles.com/ugd/97634b_3ac2fdcedb0946ed9e46d272d6dee9c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5e8d0f10240461e9b98d1a2b99c762d.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/26415823167.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/59592771494.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/95175463278.pdf
    • https://static.usrfiles.com/ugd/0511f5_6bc8bfb10f304a27b5b71f9101e2e3e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb275e7da9c0471490bf517e1f9ab0d3.pdf
    • https://static.usrfiles.com/ugd/0aab01_260681a3bb694dcbbde04f4448740d58.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_off000041d6.bin
9b29b58044f786e9075e40ff902368b23c04b1fb009b7a5ad1d179f199b858e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x41D6 5124 bytes
font_01_sfnt_off00005338.bin
7df0b2d239c6218deb93eb8a745111690a5de0626ba1deef79f9419f27f0163b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5338 9504 bytes