Malicious PDF — malware analysis report

Static analysis result for SHA-256 424398ef39e5eac8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-31 04:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2216497df2705d43deb91bb68e07af3 SHA-1: cc1495a62f82e9524b385ebd29002446893c43f6 SHA-256: 424398ef39e5eac87fbff008a990be51782c5c71eca0ef6a32088a5b07e7eea2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a download link for 'chris brown deuces download'. The PDF also contains a large number of external links, many pointing to Shopify domains, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier 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.cc/wix?keyword=chris+brown+deuces+download
    • https://static.usrfiles.com/ugd/b8c837_d3f949724bc44307b287ca0525c7a590.pdf
    • https://static.usrfiles.com/ugd/8b49c6_0a44470d1eb343439c070cbad438bf56.pdf
    • https://static.usrfiles.com/ugd/aef5b7_862f11b10ed541fd8a3563a6f287d699.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/58804893344.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/75472320812.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/ziwiga.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/20382659443.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/79260765534.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/79694169774.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/26250304016.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/polujatuxuruwiwisuzexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/bescherelle_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/xizukoxetafedopimurewape.pdf
    • https://cdn.shopify.com/s/files/1/0438/0730/9986/files/pdf_digitalni_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/dufatesevog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f30.bin
f0cd73bb43ae0c6ee4fa930b47b4013d2dcc1c5b06fe958d1935a262facaa0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F30 5164 bytes
font_01_sfnt_off000060bb.bin
fbc7961eed71adf7489280eda8db2756650efd81c6bf18dfcefcb97ce183b714
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 10208 bytes
font_02_sfnt_off00008399.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8399 18776 bytes