Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e7eba4870c0ac1…

MALICIOUS

PDF

45.2 KB Created: 2020-08-08 11:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4859df66fda3e7a9295cef53bd54be31 SHA-1: 3409b753a0fe2202a0b118f57f71c35a0c9242b2 SHA-256: 70e7eba4870c0ac135e193ae677584ad667cb7d0624800ab19d9b313905eca75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic, suggesting the primary purpose is to drive traffic to malicious sites.

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/pify?keyword=norma+aashto+lrfd+2020+pdf+espa%25C3%25B1ol
    • http://files.ctai.ie/uploads/1/3/1/3/131379324/7128176.pdf
    • http://files.csaheating.com/uploads/1/3/0/7/130775027/dedikajokan_safukotigila_limoruvanu_gedusugegobuwib.pdf
    • http://tagubaw.alleganycountyrestaurantweek.com/uploads/1/3/1/0/131070420/7f488ab49b.pdf
    • http://tagola.clankerr.org/uploads/1/3/0/8/130813528/jalefetimexej.pdf
    • http://ratimab.enfieldjolf.org/uploads/1/3/1/3/131398140/vekakufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/guputatumazuxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/nidarufojabitufuni.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/basics_of_c_programming_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/javascript_check_if_object_is_empty.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/savaxufagokiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/lujijenelolobopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/meio_ambiente_no_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/griffith_theory_of_brittle_fracture.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/gagugugedidebowugexoforux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7385/5903/files/12557640054.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/jupipubujezuroraj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/wow_windwalker_monk_talents.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_off000070aa.bin
f87d238af633cbac742b0d741bdf377fc41b1d7ac3e5901345c77221847c9c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 5736 bytes
font_01_sfnt_off000083c0.bin
f1f1e8844d38172dc9a35671c702d1e53b8ae6ada9a3538edcbd28db24210031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C0 10020 bytes

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