Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a043986d839bb3…

MALICIOUS

PDF

39.2 KB Created: 2020-08-28 04:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29da943c40c1bb8006d77c1aa06c1074 SHA-1: 4ac098fb7dc911a8e2943069bbc97a2d3b929d89 SHA-256: 04a043986d839bb3d7df69bf507b83748ee2808ee5304eec96e2d8445f1c127f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One of the primary links directs to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to obfuscate malicious intent through a large number of seemingly benign, but ultimately controlled, external links.

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=arbol+con+raiz+dibujo
    • http://files.matesoundthepump.com/uploads/1/3/2/8/132815181/jiwefumuduvunu-kokatul-legupolum.pdf
    • http://files.inveniremedicos.com/uploads/1/3/1/6/131607467/694ad39.pdf
    • http://files.drsheilamckenzie.com/uploads/1/3/0/7/130775286/a39ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/72051105522.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/commercial_building_design_project.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/anxiety_disorders_interview_schedule_for_dsm_5_child_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/6946/2935/files/the_filmmakers_handbook_epub.pdf
    • https://cdn.shopify.com/s/files/1/0460/0292/9831/files/jogumedaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/definition_of_oral_communication_skills.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/computer_security_powerpoint_free_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/ravugajez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/crazy_stupid_love_movie_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0447/7085/3013/files/autocad_visual_lisp_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/zelibeduzep.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/72680449336.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_off00005d53.bin
f0836a2affa2e4ca05cb8e170164e65930b1c9ad08e45f044ae522f25e1af279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 5012 bytes
font_01_sfnt_off00006e65.bin
d5f2d1391dffd2762ea3a22bae95869875847d8f8ce14bc3f40ec2236752dee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 10380 bytes

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