Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e430508352b53…

MALICIOUS

PDF

37.4 KB Created: 2020-08-18 23:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37952a4a2de160a554dfb8e4c6ee684 SHA-1: d539f18e93053ac79e9a56151c70af19f6c88df9 SHA-256: 5b4e430508352b53fc4453068dc4d61f841c93ce7fd9c45e869408e4cb104ec3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, https://ttraff.ru/pify?keyword=childhood+trauma+questionnaire-+short+form%2528+ctq-+sf%2529, is identified as a known malicious redirector. The presence of this malicious link and the link farm structure suggests an attempt to direct users to potentially harmful content or phishing 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=childhood+trauma+questionnaire-+short+form%2528+ctq-+sf%2529
    • http://files.reelmemoriesvideo.com/uploads/1/3/0/7/130775510/2599952.pdf
    • http://files.clbchouston.org/uploads/1/3/1/4/131452988/bavulubitugujegoxo.pdf
    • http://files.gaggiamanualservice.com/uploads/1/3/1/4/131452950/d6af5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/36389817549.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2666/files/lalojuxol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/munubojazovadobifezet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/classification_of_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/78229001021.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/berr_admin_react_admin_dashboard_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/american_pie_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/raxepoda.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/leadership_and_leadership_skills.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_off00005280.bin
ea744ef8645468587315120685d3ff8571813834ccc21ce435f08481204df280
pdf-font-stream PDF embedded font (sfnt) at offset 0x5280 5480 bytes
font_01_sfnt_off00006509.bin
629c53403d3412fb7a99ce15cb87de1342dd7e729b3f6c90528aad7bf7828140
pdf-font-stream PDF embedded font (sfnt) at offset 0x6509 10488 bytes