Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4964b391bda7a0…

MALICIOUS

PDF

56.0 KB Created: 2020-08-24 23:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8acff6d52b961167d00ba9d12e5998 SHA-1: 54e6d3f01e87961e21055177f1d870c76d1a3eab SHA-256: 0b4964b391bda7a0ae55fd99b22adc8f6c244e80a61ea5fe5116cf76dfebcf70
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 external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=html+table+to+pdf+jquery'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded links and the nature of the heuristics point towards a malicious document designed to lure users to compromised or 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.ru/pify?keyword=html+table+to+pdf+jquery
    • http://narobalim.flexitunnel.co.nz/uploads/1/3/1/8/131856703/8200360.pdf
    • http://nebixejuf.peterstowntec.com/uploads/1/3/1/4/131412032/pukav_kuketukonekiv_pevelelur_tupefe.pdf
    • http://bematiz.whiteaisle.org/uploads/1/3/0/7/130776483/1563274.pdf
    • http://files.kittisakchoojun.com/uploads/1/3/1/0/131069899/dabopevibupor-jazojod-powilad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/fiwujixezulufonexanumis.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3998/files/fovifufenijipenuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/23975707635.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/amlogic_s912_android_tv_rom.pdf
    • https://cdn.shopify.com/s/files/1/0435/3916/9429/files/rewovamokagefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/calligraphy_alphabet_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/nepufukabuduluweb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/rulijez.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/80433190666.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/non_verbal_reasoning_analogy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/calligraphy_practice_sheets_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bea.bin
fe3cb5c2a88f1abb2308c949d39fd1bd6c945c2434f49888951917733cfa5aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEA 5484 bytes
font_01_sfnt_off00008ead.bin
3d48d394d28fb3e56a9bcda0332bfd2603ec4d0b3aad176aebfcf23f246b4c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAD 5412 bytes
font_02_sfnt_off0000a105.bin
ba6df44da2b8cdd8a080f69029185f8c2fbb39ab23e43d89a60e8ac3db092dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA105 16004 bytes

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