Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf21a6e8c67323…

MALICIOUS

PDF

46.5 KB Created: 2020-09-03 05:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323fa37ef67b05b655c60db60ca3b9f6 SHA-1: 9122902a60d5e9c5630250cf88890590148ae8e8 SHA-256: dcbf21a6e8c67323f149f52767edfe90d47f5102ff4b1940b393680b75e4b393
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=crucifix+crossword+answer', is designed to lead users to malicious infrastructure. The document also features a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0459/9735/9261/files/vineland_adaptive_behavior_scales_2nd_edition.pdf'. 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.link/wix?keyword=crucifix+crossword+answer
    • https://cdn.shopify.com/s/files/1/0459/9735/9261/files/vineland_adaptive_behavior_scales_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6868/6497/files/84565218848.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/famine_of_bengal_1770_to_1772.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/soxotuduj.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/rafoze.pdf
    • https://static.usrfiles.com/ugd/e3834b_742e93056ec040a59f0165e5c1af1280.pdf
    • https://static.usrfiles.com/ugd/e66789_ad2e8dc2ba9a44b1b885abffd6fa358a.pdf
    • https://static.usrfiles.com/ugd/0baf77_bb8c9df577634ccf8fa3a2ee9a8585e3.pdf
    • https://static.usrfiles.com/ugd/accd1f_6586db7f2a5e4546a27839d8cf5b0224.pdf
    • https://static.usrfiles.com/ugd/21e6f2_7cae73083af34a5eb1975eed69a48f6d.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/79469423920.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/alexa_app_fr_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/zitifekebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3366/5441/files/actual_keylogger_free_full_version.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/
    • https://cdn.shopify.com/s/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000793d.bin
e023796e3fe87f9acf11a9de413ce2ad98f35c0d68f84225141a389f1e65b710
pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 5048 bytes
font_01_sfnt_off00008a92.bin
fa043f138a0b85912aedbf785c831e81c2ed259f128eb1b9dccdf8c524f4f0a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A92 10096 bytes