Malicious PDF — malware analysis report

Static analysis result for SHA-256 2925fd69f94af2f9…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 13:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d676d7ae10bb73660da5961e480182d1 SHA-1: 9977c42374711e291b778d5ae18c8dc42bdfed71 SHA-256: 2925fd69f94af2f9054469f4ad0de9ba3078d9bd175ec8f555221d30fdb736c5
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests a social engineering attack aimed at directing users to harmful content.

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=tabla+de+numeros+aleatorios
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/lutifejobimubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5366/8769/files/both_automatic_and_manual_cars.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/adding_integers_coloring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/xaxomike.pdf
    • https://static.usrfiles.com/ugd/accd1f_ed2c7efcb3ce4f87b64095adf4800bf1.pdf
    • https://static.usrfiles.com/ugd/c345b0_e65210d8b82d4c10a46671376d638a48.pdf
    • https://static.usrfiles.com/ugd/97aff7_a5b4a1f5562749d3bf993a35ad676568.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/50982950074.pdf
    • https://cdn.shopify.com/s/files/1/0430/4823/9257/files/henry_danger_episode_guide_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/noxel.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/68779364142.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_off00005a7c.bin
4f4bdab1fc4d697c84be78eb9e25fb8ed353c0ea3c8f55ac0c13f92e538f7be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7C 5060 bytes
font_01_sfnt_off00006b92.bin
81e2176d3cf7ebee261126c20957392eed14bc5e37647fb907e285bbfd274b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 11184 bytes

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