Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3e8bf259c29d3e…

MALICIOUS

PDF

39.0 KB Created: 2020-09-12 17:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06520ff154901044508ac6786d5d063e SHA-1: 9b53ca064cdced598423c7825fea926424cf9e17 SHA-256: af3e8bf259c29d3e9da76c274d2a3a4a147ea8fbe0be5e5f40a649373992991d
150 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 of which point to suspicious domains and are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=conjuntivitis+bacteriana+pdf+ni%25C3%25B1os
    • http://patovifo.nmbstateforms.com/uploads/1/3/0/8/130813821/dinudedewiribogenu.pdf
    • http://files.torranceco.com/uploads/1/3/0/9/130969422/vularilasizebalura.pdf
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdf
    • http://files.cedarwoodtrust.com/uploads/1/3/1/4/131406811/8944268.pdf
    • https://cdn.shopify.com/s/files/1/0428/9799/7991/files/autodesk_inventor_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/dengue_cenetec.pdf
    • https://static.usrfiles.com/ugd/105a8c_eb4f944ddbd544948caff47bf27b190d.pdf
    • https://static.usrfiles.com/ugd/06497e_716e0bd6b0e54f42aa9faabb775e70dd.pdf
    • https://static.usrfiles.com/ugd/466fa0_b7061745deb94054999db2a8154536d8.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9317/files/suxilafexobofiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/latitude_and_longitude_worksheets_doc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6636/7895/files/unicode_table.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_off00005970.bin
eb17a9674f486b326ef651f89ae40b80316fa60c0bc181d87f1f8088b796dc31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5970 5512 bytes
font_01_sfnt_off00006bf9.bin
3d3c75f34df5eaada70ad9e71fbf9391859e15157d01b92cb48780726eda0c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 9880 bytes

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