Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba35a683bd2a20f…

MALICIOUS

PDF

66.1 KB Created: 2020-08-12 23:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf998d7a80419f08ce86097e862d74f SHA-1: 02c9108cec9bd702998f473e18eeb46d6a564bc9 SHA-256: 5ba35a683bd2a20f668c5493e24d5947c8bbb3e5661d0101abd177c161cb58e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/wb?keyword=corpus%20hippocraticum%20pdf. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content, likely as part of a phishing or scam campaign.

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=corpus%20hippocraticum%20pdf
    • http://files.jslvisions.com/uploads/1/3/2/8/132814241/depuv_povasosas.pdf
    • http://files.victoria13gla.ca/uploads/1/3/1/0/131070722/4c117c.pdf
    • http://xofebo.gusttechnology.com/uploads/1/3/2/8/132814930/xabefa_jutojowevem_sewupenisijid.pdf
    • http://witaki.melissasugarman.com/uploads/1/3/1/4/131454065/3404020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/change_text_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/application_form_for_employment.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/bujimigovari.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/sajisajiburemovewisas.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/99477022487.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/sizigosipede.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/ubuntu_mount_smb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2854/4668/files/memovenupejoputegi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3150/8645/files/safimijezepuwilelepikep.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/pejurudubiden.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/convert_html_to_api.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/77604836500.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_off0000c4e5.bin
531f1a9aaa114486945c378841e8964d3df2e80addb3f431abb4062a4ee62091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 5268 bytes
font_01_sfnt_off0000d6a5.bin
14e75d471cae946fc72bf9fd8bfaa69067470baad7a8f7bd5cadccdda05c298a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 10812 bytes

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