Malicious PDF — malware analysis report

Static analysis result for SHA-256 852366a16c98eaf9…

MALICIOUS

PDF

41.3 KB Created: 2020-09-18 09:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0307c26c9d42162c9d0e6d8b5ed1c76f SHA-1: 2cca90406568a04db11337dd67be4998d9dfb5d7 SHA-256: 852366a16c98eaf91c6111243167178a904a85752006671094177ab722295057
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The document body itself is heavily obfuscated but contains references to the search query 'mutants and masterminds character sheet 3rd edition pdf', indicating a lure to potentially malicious search results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=mutants+and+masterminds+character+sheet+3rd+edition+pdf
    • http://gojur.randolphptocouncil.com/uploads/1/3/1/1/131164439/fasejorofevikikebu.pdf
    • http://files.kickstart-hr.com/uploads/1/3/1/1/131163949/detopanibiki.pdf
    • http://files.angelsrestqld.com/uploads/1/3/1/4/131438759/9a259b.pdf
    • http://sigug.kestersoncoyotes.com/uploads/1/3/0/7/130739291/1320730.pdf
    • http://nizaru.andrebretoncycling.com/uploads/1/3/1/6/131637308/vokijulena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1dde60d3-18cc-4e99-aa79-5fd0a3ac1eae.filesusr.com/ugd/105a8c_e903be6f6a6e4065ae94f51d3e20e891.pdf?index=true
    • https://c6d9f410-439d-43a8-bce9-da3600a72316.filesusr.com/ugd/98e298_5c82aa8663d54cfda13d9a7cf011bd09.pdf?index=true
    • https://120e9e45-7d6e-40b4-b353-9d6a935c7b7e.filesusr.com/ugd/595093_4533b431cd5f41c6afb3082eb116be95.pdf?index=true
    • https://06223172-a556-4c3b-aeb9-68f0acb42421.filesusr.com/ugd/227d0f_6394c4099b314e9bb0818473adf3633b.pdf?index=true
    • https://dcac5f58-bd9a-4edd-a3c6-022572baa16f.filesusr.com/ugd/ac1638_4ce82ae0115f4c9fb66252c40dd1a552.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/5618/4996/files/pafunufusib.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/mebodasugedokipopexozuz.pdf
    • https://cdn.shopify.com/s/files/1/0463/1766/6461/files/relegizotepovufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/lesivapetaxuj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe3.bin
7ff4430be6703497889ff255763ba810f0eeea40a6372f33d3c4762897ab84ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE3 5532 bytes
font_01_sfnt_off00007295.bin
8f203f221b558d8ead49333ae3de71f4dd07594c10b6267ca12f71328f57e2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 11068 bytes

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