Malicious PDF — malware analysis report

Static analysis result for SHA-256 11afd101a293e603…

MALICIOUS

PDF

42.1 KB Created: 2020-08-17 18:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cb87853bd17e30930abadaf0f45d99f SHA-1: 91d6e47fd55a2f06e964c06e2f265d6345c37a4c SHA-256: 11afd101a293e603738ca08588cd573c2ca1acc531001f38efe2bf78cd0ff80c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The primary URL identified, 'https://ttraff.ru/pify?keyword=associa%25C3%25A7%25C3%25A3o+mista+de+resistores+pdf', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect users to malicious infrastructure.

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=associa%25C3%25A7%25C3%25A3o+mista+de+resistores+pdf
    • http://xetise.sarexplorer.com/uploads/1/3/2/3/132303382/nubotewot_runomu_bizoxu_jonule.pdf
    • http://files.ainokonkka.com/uploads/1/3/1/6/131637148/zawoforuv_xarelapowidu_monagidevev_tadililowomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/canzoniere_chitarra_download_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/the_offspring_hit_that.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/il_bovarismo_jules_de_gaultier.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/27225289458.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/sujufoditukizakadifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/pemogidusovegugeneku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/nusitokiwuvojot.pdf
    • https://cdn.shopify.com/s/files/1/0439/0980/8280/files/calisthenic_workout.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_off000062f3.bin
e77d937d0f98a1fb74c634cfd46dd6a85412a0daa280d18b10bbfee152489492
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5760 bytes
font_01_sfnt_off0000758d.bin
56dcc7228855f42a9c8d36fecf4c411d4d56c12fd8278f3cf7f85a50782294f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 12244 bytes