Malicious PDF — malware analysis report

Static analysis result for SHA-256 21797acc027e91aa…

MALICIOUS

PDF

47.9 KB Created: 2020-10-28 01:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd463ad1c67a74e12f9341883bd63a2a SHA-1: 9d88ec00c858bac38dc6528c7dde509e1e2a9ebc SHA-256: 21797acc027e91aa4f899503c54dc0b2031261062b2b603cf040f38da809edcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious websites. One of these links, 'https://ttraff.ru/123?keyword=supreme+court+cases+apush', points to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to distribute malware or phish for credentials through these 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/123?keyword=supreme+court+cases+apush
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/25141.pdf
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/mekezozigug_lodotaze_jokija_mupataxolaj.pdf
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/vitixazadedej.pdf
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/xolatovirox.pdf
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/5950913.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f87336430f23.pdf
    • https://xivixomepovi.weebly.com/uploads/1/3/4/5/134518427/neridugevulelo_gadax_gilif.pdf
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/4981379.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f89602c63555.pdf
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f9252c9601e3.pdf
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8e9efc9ab18.pdf
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f8feb70a32d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d734c0a5-c2dd-4d8a-b386-350ffdbf3094/34457967456.pdf
    • https://uploads.strikinglycdn.com/files/df35329a-8237-4a47-b1ef-f481aedc08ab/71347446815.pdf
    • https://cdn.shopify.com/s/files/1/0494/4320/9383/files/michigan_builders_license_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0496/0482/1144/files/my_singing_monsters_breeding_guide_deedge.pdf
    • https://cdn.shopify.com/s/files/1/0495/9951/2740/files/tekken_3_game_install_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0479/2139/7927/files/jovoxatejojur.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_off00007e5a.bin
5d971b1b372c8263e01e7b3ac4a3677d3719696a007c8dfb33f805fe2516bb7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 5244 bytes
font_01_sfnt_off00009004.bin
37cc454126ee50259e8fe1435f5b3d9819ff20bfe34a6d8956c3b84c051d8585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9004 9992 bytes

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