Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95f9b15b83f432d…

MALICIOUS

PDF

34.8 KB Created: 2020-08-29 07:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dc4dffed5f18988240015fa2f6cfc5 SHA-1: 763992184da1e2454532cd8eb688cb1cc2d09be3 SHA-256: c95f9b15b83f432d0dbc16d6c65b8ad2c9d2db4aec358d449bff96788921c91f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a potential link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/wix?keyword=iready+games+dig+site), suggesting this PDF is part of a larger malicious distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

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=iready+games+dig+site
    • https://cdn.shopify.com/s/files/1/0440/9812/5976/files/37974415576.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/18842375259.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/replace_text_in.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/charleston_tide_table.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/who_was_helen_keller_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/6329322020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/6021850821.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/16781944300.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fb304e076964a2db177e8e091212e4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d9b459787ec429eb78af5b7178c33a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb2549c1709c401083fb11ecd6cbabc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceddf993e4b54ec79a7a96f85822c09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf05ce16c7674097a1f1da5467c5178b.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/weribowagujaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/givekozorupit.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_off00004b4c.bin
3339bdbe22378d8c4b0ff865b4f7d2b6698ff73fd28f948b34ac1d78389fa9c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4C 5152 bytes
font_01_sfnt_off00005cbd.bin
fe538b6d3ef2fa5399f010382c9e03bebdef893ebcce3561c075b14703b7b923
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBD 9892 bytes