Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7df3077a2a908ba…

MALICIOUS

PDF

41.9 KB Created: 2020-08-20 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2519e7ae3b6a5a3cd594a3cc273307b3 SHA-1: fe7269b2390b955693795c26e3a13de2155a460b SHA-256: a7df3077a2a908ba1cc484321f2b3935ebd582335c7b5d715f67eac6998f4e74
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting PDF files, and one critical link to a known malicious redirector. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery.

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=conjuntivitis+bacteriana+aguda+pdf
    • http://files.talkitupbendigo.com/uploads/1/3/0/7/130739713/xomuwo.pdf
    • http://files.mello-works.com/uploads/1/3/0/7/130739826/4469358.pdf
    • http://japasopu.paulpaper.net/uploads/1/3/0/7/130776299/fewogopu.pdf
    • http://gunab.5elements.ch/uploads/1/3/1/0/131070318/konoman.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/adobe_illustrator_logo_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/carotid_duplex_ultrasound_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/kasibup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/lisudok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/43823458250.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/lemesesiwubulaluje.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/57733783409.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/drdo_ceptam_09_a_a_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/solubilities_of_inorganic_and_organic_compounds_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6058/files/48133609761.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_off00006181.bin
e5607e9103e89791af50dd00453c9f0cdb65d68e6fc2e59d56f68c1bf6cd1947
pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 5472 bytes
font_01_sfnt_off00007433.bin
d4c53184c74ab7cf52332118e81908d9cb1e0272e98240ba5dd5c5341598f2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7433 11436 bytes