Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca035177cdf79ded…

MALICIOUS

PDF

39.0 KB Created: 2020-09-19 03:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c070b68cb4919e1a3c09a8bd06fbd4 SHA-1: 57d5185218b65aedeeb0b556224c1192366cf749 SHA-256: ca035177cdf79deddd0a9a30e0cd58679483d81b9802755bce1b749e84114000
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, the ML classifier flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a large number of external PDF links, many pointing to files hosted on filesusr.com, suggests a link farm or SEO poisoning attempt, likely to obscure the malicious redirector.

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.me/wix?keyword=dickens+of+a+christmas+spartanburg+sc
    • http://files.christaevansheath.com/uploads/1/3/1/6/131606343/noxiwurigez-numida.pdf
    • http://files.willisandsonsfuneralhm.com/uploads/1/3/2/8/132815979/kovanete.pdf
    • https://8cb515e0-5c16-460f-a991-e5771e86ad9c.filesusr.com/ugd/50988c_90f512bb2cd74ac7a800bfbf0dac6105.pdf?index=true
    • https://47d15d5b-82e7-4edd-a785-7a4975fde1db.filesusr.com/ugd/73c254_76583c1c433d43e387aa3c727d235d63.pdf?index=true
    • https://f599b4c4-75e0-41a5-a5da-a8ba03868805.filesusr.com/ugd/238140_1f3ed2c7eca943bab627b6f15615e551.pdf?index=true
    • https://644fc45a-d96d-4acf-bb47-90dc16b25ba1.filesusr.com/ugd/d1c05f_e35f657ce3054b4fab6b71fbf5fae8bb.pdf?index=true
    • https://1242d448-8f36-4cb0-adf1-861ae9a8af9a.filesusr.com/ugd/3d514e_35d37fb33e8646a4bb152a20ae3e2ae2.pdf?index=true
    • https://902ac904-624a-4681-967d-260380370189.filesusr.com/ugd/d4c4cf_0a2896153df6413e82cb2d4be3a93518.pdf?index=true
    • https://eb1556a2-b224-4a79-8acb-239e9d3422ca.filesusr.com/ugd/5cd33b_645c7424567d4058b8cb9f27a0eb08e6.pdf?index=true
    • https://4cae7137-ab93-4f70-b400-2cfd88cc659f.filesusr.com/ugd/c67d0c_465c4c6fe1574f9d9294258c2ab68f84.pdf?index=true
    • https://e98d8893-cc9e-4fdc-abb2-605b76114483.filesusr.com/ugd/c33cdb_384741bba14d4053afa0634498bd1154.pdf?index=true
    • https://fe4b244f-09ca-4288-913d-858b848d927b.filesusr.com/ugd/a43ec6_e4db50b69243479580535e8db4e96b45.pdf?index=true
    • https://5f0d3462-d2e5-422e-9d14-789b9b38aff2.filesusr.com/ugd/41f880_787c8612127446179bffbc668a3b726b.pdf?index=true
    • 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_off000059d1.bin
35c8557ad918281b9ce1d7be3329010a9a6e9c0c3a35b34b9c1446d45585d906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D1 5600 bytes
font_01_sfnt_off00006cba.bin
a5f44e7f9d28a202bceaac34d3203e9c5d75b8d8eeb8ce6ca9a3b2a59438b935		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 10132 bytes

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