Malicious PDF — malware analysis report

Static analysis result for SHA-256 4131750602ee47f0…

MALICIOUS

PDF

44.9 KB Created: 2020-08-05 05:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: defadd116d4b4da509e853f991a172bc SHA-1: f3e0b136f2a99af4bb32f80af53359c76da6c1b4 SHA-256: 4131750602ee47f0948823df86f2d7e9c619cab091be7666a4bcc161258034fe
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as an article about climate change. The document also features a large number of embedded links to other PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier 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.ru/pify?keyword=articulos+sobre+cambio+climatico+pdf
    • http://files.goldenbearsbaseball.com/uploads/1/3/0/9/130969633/1079184.pdf
    • http://files.rapidpcb.com/uploads/1/3/1/4/131437107/8655639.pdf
    • http://monenad.bakeitsg.com/uploads/1/3/0/7/130775735/jiwoxikanitulenip.pdf
    • http://files.emporiabasketball.com/uploads/1/3/1/6/131637896/00105.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/fuwivusiwudidejekubir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/xavedilakoxisigujimulibas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/direrazaruxafifap.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/16647148183.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/fomoliguripalereme.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/fesiwopesiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/dodezobikez.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/85750644359.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/48809576651.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/vujafi.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_off00006f04.bin
b29bde5b00da9221d7830fc4346cae4d824214fda937d4a419fecb8eaf900e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 5432 bytes
font_01_sfnt_off0000815f.bin
64f11ed0d8bfa46e3f211b1dd4968f7e84bd57284d3e9e2dd792fd2228e291df
pdf-font-stream PDF embedded font (sfnt) at offset 0x815F 11456 bytes