Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5053a6c7c296817…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 02:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1067e8c94e6b68a137ed67af9080af6 SHA-1: 894234ca7a4014986be46cd6ff422cc2aa9ee01b SHA-256: f5053a6c7c2968177fb86b9f3a0e8710f081c80276766493e98d07ab544c4b61
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, a common tactic for creating link farms. One of the primary links, 'https://ttraff.com/wix?keyword=centos+7.+7+iso+image', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in directing users to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=centos+7.+7+iso+image
    • https://static.usrfiles.com/ugd/07e02c_67e787a89dce4feb91b1dff0fdd89df3.pdf
    • https://static.usrfiles.com/ugd/2274a7_1878d24d262a4639b45756750c8fd3e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e3fd9b63754def9f9f155dcc2c4c7c.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_fdfbb6ec3e3044daabf9954b10b35861.pdf
    • https://static.usrfiles.com/ugd/ab922d_bd71a0685f4547b78a961cd91e8b9581.pdf
    • https://cdn.shopify.com/s/files/1/0437/4750/8376/files/black_hawk_down_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/coleman_1850_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3806/files/wijinapisanaridikogotono.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/xenuzo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/83124135851.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/bash_parse_json.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_off00005fb1.bin
23d3e1628d8fb8df09d9b8058575978b8cf971d2d978241f35aa314ccb146c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB1 4892 bytes
font_01_sfnt_off00007053.bin
19c1640643d5e30274419fcbbbeb3fe5370f16b42b28beb79da2ad94ff6139cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 13848 bytes

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