Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6175948a22256e…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 07:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8513267a468cea17d21320a1b0be7f65 SHA-1: 17c7730758d515da74b07b180eea93b3eb845ecd SHA-256: 6c6175948a22256e5d0aefca88f6da738cca2da05b9f7ad4d629a4e8f15b995e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector URL supports this assessment.

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.ru/pify?keyword=curious+george+upside+down+song
    • http://files.knuckleswhiterock.com/uploads/1/3/0/7/130739062/dosowolobibaxobiwixu.pdf
    • http://tivobobax.swhiteyart.com/uploads/1/3/0/7/130776585/bipolajo-xabej-fuzipibufini.pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.acssdownload.com/uploads/1/3/0/7/130739308/bakinike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/alto_sax_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/minnesota_merit_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/16533986888.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/cancionero_infantiles.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/biwidasatobepefitopobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7760/6303/files/dave_ramsey_budget_sheet_percentages.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/3_year_old_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/dibabitewojatakot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/lexical_and_structural_ambiguity.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/airmen_mock_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/57917823003.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a6d.bin
2536bcc0b2230fceee0f441c3a360eca17f3b0ce6ca7dffab4904cf221b18f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6D 4804 bytes
font_01_sfnt_off00007ad9.bin
4db62ec5be5bed03d3757e79e00ea0b369b45439354bd67bef2c8c48968407ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD9 10520 bytes
font_02_sfnt_off00009ed2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED2 4324 bytes

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