Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d111308f78813e…

MALICIOUS

PDF

42.1 KB Created: 2020-09-19 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1f02ed0c1bb7e644b688e2143642e1 SHA-1: 981000f077aed9bc1dbd1356f368796f741c8e02 SHA-256: 04d111308f78813edc47b0c9d2ff649168fc780005f948952892336796cabed2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The document body, though heavily obfuscated, contains text related to graphing functions and includes a URL that appears to be part of a link farm, suggesting a tactic to manipulate search engine results or distribute malware. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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.club/wix?keyword=graphing+piecewise+functions+worksheet+algebra+2
    • http://files.tayahanson.com/uploads/1/3/1/1/131163953/nuvokufube_wixikenag.pdf
    • http://vemaxabim.parohia-kassel.de/uploads/1/3/1/4/131438397/kuwimawolusutuv_zenagevok_zubolofujofu.pdf
    • http://jewaruk.readingtolearnsouthafrica.com/uploads/1/3/1/4/131437092/gukumefisatu-dorir.pdf
    • http://zusazok.ausysaddles.com/uploads/1/3/0/9/130969018/tepezugosasituduri.pdf
    • http://files.doncasterchoralsociety.org/uploads/1/3/1/8/131871414/03d3f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/polexevazile.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/bladder_training_with_foley.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/32474786477.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/92363423934.pdf
    • https://dbcec4de-b883-46d7-ad9f-b0a62847ccae.filesusr.com/ugd/b1dabf_c26c4fc701174466aed53064dafeb428.pdf?index=true
    • https://c7b431ce-8cfe-4e8f-8f3a-0e75883650ca.filesusr.com/ugd/efb3f0_4e13fef8fbd74d6c93279531c5119d84.pdf?index=true
    • https://ee87493f-4587-4948-80d9-06c8183028da.filesusr.com/ugd/8e66a5_3175097a0ac8472b8cf672bad9269d82.pdf?index=true
    • https://eff84653-f901-4192-bbec-e374a24c91f9.filesusr.com/ugd/724bd4_abb9e80310dd4cf18e2417bff566eae9.pdf?index=true
    • https://39427c11-bd3d-4eed-ae9c-92fec0b6fa91.filesusr.com/ugd/43d2fc_0fd8264decfa49fb98294db2c23822eb.pdf?index=true
    • https://0f97e63a-4e48-41ea-a02a-e3f2e0c84285.filesusr.com/ugd/a6e5e9_1f1fc9e12ccc44adaffedeb2e6baa387.pdf?index=true
    • https://d51b215f-117b-4824-bc2c-e00e697574f2.filesusr.com/ugd/21b4a7_dd5edaf102df4e7ba1b365def784aad2.pdf?index=true
    • https://e91b8e3a-fb82-4db3-9739-40094bad59b7.filesusr.com/ugd/04e6f9_69eb7d911cfd466eb48e7a195abdf764.pdf?index=true
    • https://b8b1b886-1d7a-43a1-8aa3-c9430574bb52.filesusr.com/ugd/0c8cc8_4169dc403be944b2a0062e88b4a9adeb.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006453.bin
5260d13c3e1c4926e15d635abd18263fed35c6df0bb04aaded88babe0ef38c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 5736 bytes
font_01_sfnt_off000077f4.bin
2f8a2f76a092b82cc62aa8941a9dd8ab27d249a85b2208ac62ba3d07ce600dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 10312 bytes

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