Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be3c80770581869…

MALICIOUS

PDF

38.0 KB Created: 2020-08-16 13:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 741d556777e137932a4715de1989c2d2 SHA-1: 6e03a26f3da173a896a5baf94d4e704e15ca3c5f SHA-256: 6be3c80770581869990dc34afc5fa4445187b757bab049d75b7e75bf68751df9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign-looking documents, but one critical link redirects to a known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or redirection 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.cc/wb?keyword=complex%20or%20compound%20sentences%20worksheet
    • http://gidunopo.simondeacon.com/uploads/1/3/0/7/130776428/e024c.pdf
    • http://zutedalu.ngfmeetings.com/uploads/1/3/1/3/131383297/sufukegiwevupiroje.pdf
    • http://files.torreypinesfootball.com/uploads/1/3/1/4/131483098/tarugaxogumomefite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/0311/2616/files/mathematical_physics_by_arfken_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/rafagedetosixuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/3574/4673/files/insulin_aspart_davis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/tiwitozofa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1630/4278/files/tefipefugikakinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/95993537284.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5650/files/technical_drawing_with_engineering_graphics_15th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9203/files/65013614236.pdf
    • https://cdn.shopify.com/s/files/1/0454/9489/4744/files/demedofakunapam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/81130108894.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/1834354289.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_off000058c2.bin
65f24e284fb0087a42d7536b12f58d1a2771e16eace2ac3bad6ee71fa89ea4b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C2 5232 bytes
font_01_sfnt_off00006a75.bin
651a1dcfca1c5fcb0ea068c202dcd0028a830073a554a5e97091b2c40ab22c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A75 9588 bytes