Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ba6fc12d5560b6…

MALICIOUS

PDF

44.4 KB Created: 2020-08-11 09:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 152ff0f9b07ff5e7eed57f349161626c SHA-1: d973eb8541c464db2912b69da2e97c55a0bc96cf SHA-256: 12ba6fc12d5560b69f27ab885148ceaeccf39d309c761090190146cabab37f3a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=anatomy+physiology+of+eye+pdf`. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting an attempt to drive traffic to malicious sites under the guise of providing PDF documents. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a phishing or redirection attack.

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=anatomy+physiology+of+eye+pdf
    • http://files.atech401.com/uploads/1/3/0/7/130775016/3519656.pdf
    • http://files.redesignforwholefamilies.com/uploads/1/3/1/8/131857193/jowudakavesof-rusodisoton-zofokizubolas.pdf
    • http://files.mahsasalali.com/uploads/1/3/1/8/131856700/tizoxe-kusip-tebanerifuvetug-jozuburijute.pdf
    • http://files.rascalmartinez.com/uploads/1/3/1/4/131437689/8220341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/zudegekazofoduv.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/88507777675.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/zijibuduwifarolaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/fozisib.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/bofagilajuxugelegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/73538294562.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/sabol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/rilufabukenanujejukepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/the_book_of_lies_jw_hofstetter.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/serie_a_calendario_novembro_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/zatewanewanaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7727/files/automatic_control_systems_benjamin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/275640124.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_off00006c0f.bin
1267870058d99b27a684703df289a17ff3bbb408683938d8b49609f65bbb3370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 5452 bytes
font_01_sfnt_off00007e79.bin
9f9c186e2902c16d8f19ab7f574a5f7f8fb5e260f51d412a00276d77fa5126ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E79 10624 bytes

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