Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3dfb1c5dbe8028…

MALICIOUS

PDF

45.1 KB Created: 2020-10-20 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b59a44158be25051473c3476cf479cbf SHA-1: 64bef7d6724cc5176d5ac807dc0903de5a88bd8d SHA-256: aa3dfb1c5dbe8028f2e7dccd2ca3e11cd95b15c3af42eb2db950de188baf20f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded external links, many of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies one such URL, indicating a high likelihood of user redirection to a harmful site. 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://gettraff.ru/123?keyword=composition+writing+in+english+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8e06f12627a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87b6a3efa8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f86f65dc4114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5f8c80761b070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8ad2eeb0d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8df1e7c6fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f8d246d8108c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5f8c9a1b71433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f87f5b1261d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f88940f50069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f874f32bd08d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b6a7b3-b81b-4fc1-bfd0-8e278c42d7c3/rotatelebigida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b283f2af-8342-4a7b-950e-547738be795c/51487843620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c51264-f023-4239-b20e-b256b9223f36/pabiloza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2825bcc3-57cf-4bb5-9239-35adb9f37af9/38875486857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/kalender_2020_mit_ferien_bayern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1462/6717/files/dejigojogokuvuwasazef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8541/2546/files/vuwejerizetimutinuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/probability_tree_diagram_worksheets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6913 5240 bytes
SHA-256: 736850d7882242ce7f287fb482ca9d68d15ef659409098de19de35519a175649
font_01_sfnt_off00007acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACD 14448 bytes
SHA-256: f2515da21503f18db2d1bc90e555c49a3c9bc669a9ff701354a3b8d250000320

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