Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b48eab4079666…

MALICIOUS

PDF

33.1 KB Created: 2020-09-03 22:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 559e396f00b2bde7130a25b81d1e77f3 SHA-1: 366c4004379090f800e9c88fa6e85f292acb6623 SHA-256: e16b48eab4079666f7be26bffbff477ad2eb8d2c88d6c36a922ce2d9156ebc0d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (https://ttraff.link/wix?keyword=apostrophe+s+worksheets+grade+1). The document body, though heavily obfuscated, appears to contain this same URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence.

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=apostrophe+s+worksheets+grade+1 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/supesufijakiwaxovuvugosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1918/7862/files/mufifetexunajerevusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/acerbis_chain_guide_insert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/acca_past_papers_f9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/jopiwuvubop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/sejixedegidil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/131342646.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/lower_back_pain_exercises_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/rekulexapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/36984035314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5938/8316/files/recette_baguette_machine_a_pain_moul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/dewalt_dw6913_router_edge_guide_with.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/brrip_latino_mega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/segugipabivuriwekajivun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/65201841036.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_off0000454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x454F 5388 bytes
SHA-256: b6e9760d54d8b7560d717aa70668ad98ccdf0ec5638537d85f223e699e21ae06
font_01_sfnt_off000057b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57B0 9388 bytes
SHA-256: b0e5dc00851e5ed006ceedd2050dce167cce01f3c5cd8682cd0d3c7a4038ec19

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