Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc8670e88a84c4a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 01:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31805e3a7b4859b11a45d7a11fcc9bd9 SHA-1: cb1c57c05e10910dd1c29272f8124ac94e5de241 SHA-256: bfc8670e88a84c4a494729544d761045678230d958728ab8192cfe0ade80d899
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.cc/wix?keyword=poids+d%2527+un+m%25C3%25A8tre+cube+de+sable, is identified as a known malicious redirector. The document body contains garbled text but also includes the same URL, suggesting it is embedded within the document's content to lure users. The presence of numerous links hosted on cdn.shopify.com, while some are benign, contributes to the link farm characteristic.

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=poids+d%2527+un+m%25C3%25A8tre+cube+de+sable
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/netuwiva.pdf
    • https://cdn.shopify.com/s/files/1/0460/3527/1844/files/81588343593.pdf
    • https://cdn.shopify.com/s/files/1/0434/1337/3084/files/71794701738.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2522/files/canada_elections_act.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/folorijalexikosabufegeguf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/45440293599.pdf
    • https://cdn.shopify.com/s/files/1/0465/5366/1590/files/dark_web_browser_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/sap_bpc_module.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/49047168761.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/atap_genting_atap_rumbia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/16074490493.pdf
    • https://cdn.shopify.com/s/files/1/0435/2629/1611/files/4805633005.pdf
    • https://static.usrfiles.com/ugd/de3d83_a3911d47224f442fbe2fa78f4efd5329.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c39a6b23f194591a91c3961e654bdcb.pdf
    • https://static.usrfiles.com/ugd/3eed2b_b81e039702bd413593d50e02a336c207.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb6847933b43199d51d19747e5f3ae.pdf
    • https://static.usrfiles.com/ugd/22bf55_508f0587a488447987a896064b7f0eb0.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_off000064f0.bin
a0b439425d66949f15d24b537df57f2003bfd07342bab9c3e3435d00628f9e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 5404 bytes
font_01_sfnt_off000076e8.bin
cd4bffb7edca9f7c9c48511f3640f4747da7210a8fc5502c8f0916447c99fda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E8 11904 bytes

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