Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c819484004695cc…

MALICIOUS

PDF

47.4 KB Created: 2020-08-07 17:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c68215b115d255d310051bde6088f4 SHA-1: b71aac074a5afd937b49590323bca7f90c630a84 SHA-256: 5c819484004695ccd55fcd3bfe031ba9fbd43ab97eaf7817f244499137744b7c
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 malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious links. The primary attack pattern involves luring users to potentially harmful websites through a deceptive link farm.

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/wb?keyword=architectural%20record%20june%202018%20pdf
    • http://files.ittstrading.com/uploads/1/3/2/7/132710669/a06128948c733ac.pdf
    • http://files.moremilestogo.com/uploads/1/3/1/0/131071063/kurotovovisonevaneb.pdf
    • http://files.qicultivation.com/uploads/1/3/0/7/130776542/toxapujuzef-zajidupodasadel-pujenu.pdf
    • http://files.jeffchandlercreative.com/uploads/1/3/0/9/130969151/5679027.pdf
    • http://files.serialmachines.com/uploads/1/3/0/8/130874370/savudapoter-bexozijagijowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/fuvulufinenob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/anthropological_linguistics_an_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/sovubuliniso.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/css_z-_index.pdf
    • https://cdn.shopify.com/s/files/1/0430/8077/7882/files/65566540319.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/janedetoguwem.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/73867795177.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0957/files/71182866439.pdf
    • https://cdn.shopify.com/s/files/1/0428/2803/8310/files/statistical_methods_for_categorical_data_analysis_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/cantigas_de_roda_letras.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/40913735442.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_off00007924.bin
6666f2f694d8d4473a978d6821e1bdef1a44324ff02fa6564eb8445a0b21d7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 5648 bytes
font_01_sfnt_off00008c64.bin
39853e3187a3f17819fc2d9dac46f4ff5bb96b5800e68bfd2786cc111eefd486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 10740 bytes

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