Malicious PDF — malware analysis report

Static analysis result for SHA-256 40751b0c0ba67675…

MALICIOUS

PDF

50.1 KB Created: 2020-09-03 04:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d650cc9bd63efb98d7ec4f0d8af628d1 SHA-1: c779aa367252da766edd26049cf88366fc49acaa SHA-256: 40751b0c0ba67675c54120b04c5c92aca8e88677692b1cb9eb514355730d87b9
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, which is likely intended to lead the user to a malicious site. The presence of numerous other links, many pointing to Shopify-hosted PDFs, suggests a coordinated effort to obscure the malicious intent or to leverage SEO tactics.

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=determining+capacity+to+give+informed+consent
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/midland_tx_escort.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/9947399977.pdf
    • https://cdn.shopify.com/s/files/1/0431/6099/3943/files/weekly_timetable_template.pdf
    • https://cdn.shopify.com/s/files/1/0454/6537/0782/files/housatonic_river_striper_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/pevitalawopogi.pdf
    • https://static.usrfiles.com/ugd/b47706_c56313b67fce44c587144c2333980979.pdf
    • https://static.usrfiles.com/ugd/0f5b72_bf4dcdb70c0149f7b6ac8f3077553c54.pdf
    • https://static.usrfiles.com/ugd/c81504_4e4a8ba75c794fa8a8fd577c604d2ead.pdf
    • https://static.usrfiles.com/ugd/cf5aa9_6b3c8b489866472b936652a8410b3400.pdf
    • https://static.usrfiles.com/ugd/4826f5_34f0d2e8cacc491cae8d53a2a1934035.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/blenheim_high_school_6th_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/arya_2_songs_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2131/1910/files/danax.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_off00008561.bin
34011a2df70276afd06bccf48c365a4b9c4395ea10a82f7aed37e3a446e4bfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8561 5604 bytes
font_01_sfnt_off00009874.bin
fb3cf0fcf84f0ab905ee1e61978a619823e5de738e3056b6be43616acf9a4dca
pdf-font-stream PDF embedded font (sfnt) at offset 0x9874 10148 bytes