Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ead19d173261f0d…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 03:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6a82b4102d2ee7b56a769237ad69eb SHA-1: 2d31d329bb5fab1bb2d45955006bd5b42fee74a1 SHA-256: 6ead19d173261f0d8e06dfea510386b209f1a655190642ca2a0565d57b248055
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic indicates a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, reinforcing the link farm and redirection attack pattern.

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.com/wix?keyword=chronic+diarrhea+guidelines+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/baka_to_test_to_shoukanjuu_season_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/digestive_system_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/74754959793.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/3_day_split_workout_routine_for_mass.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7727/files/meralgia_paresthetica_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/format_code_python_3.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/risoguzewotulodetewuvokim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7319/files/agro_ecological_zones_in_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0447/2678/0060/files/shark_dichotomous_key_analysis_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/30666219267.pdf
    • https://static.usrfiles.com/ugd/76156b_f72e4a20f1584dc9993d177a865402ef.pdf
    • https://static.usrfiles.com/ugd/c5d40f_bd1991e054bf40d5a67cb1a359c277fa.pdf
    • https://static.usrfiles.com/ugd/d1c05f_5ec91aa842a7410fa79cd5ad31f0bc87.pdf
    • https://static.usrfiles.com/ugd/2ca22b_5a917181d9984a1cac6ba091feb50e9f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006218.bin
e2e47057f06d8bbfc11def029d3251c57b6c6ebb3723d7e57eb5846ae429cf0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5320 bytes
font_01_sfnt_off0000742b.bin
928b7eb1f081f9cebfe8cc5ef90b3e979af64a348f70653f8f263532de1104bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 9844 bytes

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