Malicious PDF — malware analysis report

Static analysis result for SHA-256 c181d0c106adc781…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 23:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d296cb2278d26a32fb6c3620a22483 SHA-1: 54b65e787a6b38f4ba25041f17f24d39d28e5ce7 SHA-256: c181d0c106adc781030f953f1896632cd802bce9e622f61ff2cd8eba79c4028b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=videos+from+twitter+google+chrome, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user 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.cc/pify?keyword=videos+from+twitter+google+chrome
    • http://delesuk.blueseavacations.net/uploads/1/3/2/6/132696030/suzuxusugadixunijixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/legumolop.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/raxaradigonofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/29918421177.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/wopilaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/form_and_gate_using_nor_gate.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/capacity_planning_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0457/8505/5398/files/bandit_queen_full_movie_worldfree4u.pdf
    • https://cdn.shopify.com/s/files/1/0440/5903/3752/files/51425766245.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/main_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/76276874970.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/wetajanejedinufadoluxaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/define_cost_accounting.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6e.bin
25598cfcee6c5f73b75884118814eb878add1844e563c3c29af7a575396ac8b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 5284 bytes
font_01_sfnt_off00006f54.bin
58efe3466564ec9a5232a8673f83e54ea06eedaeb79bfe3b4ca348040baeae33
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 10368 bytes