Malicious PDF — malware analysis report

Static analysis result for SHA-256 123176d60813537c…

MALICIOUS

PDF

33.4 KB Created: 2020-09-10 08:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ad07e77654d486b3c00c0d3d6a9863a SHA-1: c651d69690307532dc8fcefb7b675e4fcb29856a SHA-256: 123176d60813537cebc26dae15762459dea074a0d44b41e38333b6d50f18df91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body also contains the same malicious URL, suggesting an attempt to lure users to potentially harmful content. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector is a high-confidence indicator of malicious intent.

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.link/wix?keyword=bulandiyan+video+song++mr+jatt
    • http://files.atlantadentalanesthesia.com/uploads/1/3/1/4/131455883/najikenusapijevofifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/2879/9639/files/exterior_angle_theorem_math_aids_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/9595/5358/files/form_6_application_for_leave_deped.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/musimaninosojaxim.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/xodidopubutanugapebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/jenovubuwiwikamif.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/87032034236.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/rosary_guide_bisaya.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/13784845195.pdf
    • https://static.usrfiles.com/ugd/72216b_d4f34ce9a6e4484281da9596396bfbd4.pdf
    • https://static.usrfiles.com/ugd/3f4b99_da02936232614ed788ab9c4b47f9d80a.pdf
    • https://static.usrfiles.com/ugd/286fb8_510bc1dbd3ee4480b316e06478be0fa6.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_off000044ff.bin
17dd45b4db758488e28f75984465969381f7388f3be9a142178c2e53c880d993
pdf-font-stream PDF embedded font (sfnt) at offset 0x44FF 5432 bytes
font_01_sfnt_off00005776.bin
bbb30022018c5978f2233d82b01eb78039f90b23930f3dfc9d91ad5079d8b42f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5776 9804 bytes