Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbe46a122f9f76b…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 05:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d932f8dd5e0933d56785e163ccf20b SHA-1: e1442929d2fd64680def8cac329dd6fcb6940e86 SHA-256: 6cbe46a122f9f76be0351757f95d056f2b6661368e2a2d0ade21f6ce5b548194
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 distribute SEO-optimized PDFs. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that likely serves as the initial lure, directing users to potentially malicious content.

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.cc/pify?keyword=speak+softly+love+violin+sheet+music+pdf
    • http://mokojuk.but-design.com/uploads/1/3/0/7/130775195/120454.pdf
    • http://files.bluecrushvolleyballclub.com/uploads/1/3/1/4/131453100/dokugaboruluz_runizarijuxekuk_funakelenev_loweti.pdf
    • http://files.langleycarpetcleaner.com/uploads/1/3/0/8/130874139/cbeac60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/xowukunijegepus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/zufepunisovubogiturojus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/87903045080.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/jevaforizabelaxuviva.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/nelute.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/74729840722.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/38954284697.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6986/files/23923967134.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/6806124115.pdf
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/1334819621.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_off00006c3b.bin
0a729fbc82e624aa1bbf11c745a8fe2816faaf2ceaffcf757cf3570ab6324eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 5628 bytes
font_01_sfnt_off00007f4f.bin
79eb133ea3bac624840a08d7a69eb829bc0ed9aec93eeb4fe43b1a14333566b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4F 9872 bytes