Malicious PDF — malware analysis report

Static analysis result for SHA-256 647794d8dd8089c4…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 14:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ac0c9334cc41c43635e425e145ebc51 SHA-1: c652a504dbdd26bac4ec3e1905fbe648e5480dbf SHA-256: 647794d8dd8089c487dc848b0a3ab36b6072f6362afef480747b9857eb828433
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, however, redirects to a known malicious domain, ttraff.cc. This suggests a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=histogram+worksheet+6th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/0161/5260/files/sky_movies_bollywood_2014.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2636/files/dujerubonirefuvimifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/mobagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/gatisukaraxesunazupu.pdf
    • https://static.usrfiles.com/ugd/b8c837_232f1ba59f154013bfdfcf99f5e48480.pdf
    • https://cdn.shopify.com/s/files/1/0437/0880/9384/files/92085082916.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/lupijofukakelawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/subject_verb_sentences_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0463/4007/9777/files/bkash_new_apps.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/electrical_building_installation_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/25666432261.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/lerotuvabodewusegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1031/0822/files/reometria_del_hule.pdf
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/planos_arquitectonicos_de_casas_de_dos_plantas.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_off000052a7.bin
1ac921bf00cbc6bf06c23f1a8e283136a66567d821265015b4d18c61715aa16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x52A7 5480 bytes
font_01_sfnt_off0000652d.bin
d444f4b16db7479293d0176250c836ba291405a041b69bfe6a57c0ea52db90be
pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 10408 bytes