Malicious PDF — malware analysis report

Static analysis result for SHA-256 9166a92cdee66ce7…

MALICIOUS

PDF

49.6 KB Created: 2020-11-06 17:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5855e5bd2df95f1c21a0043de83140 SHA-1: 184c5e51ac27d50b578a49fd9493a24a32909fc6 SHA-256: 9166a92cdee66ce73695ed1719c8abdb074f1e4db859150b23cd5e21c2f11122
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ggtraff.ru/123?keyword=biomedical+engineering+colleges+rank. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, suggesting an attempt to manipulate search engine rankings or distribute malicious links. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, contains the aforementioned malicious URL.

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://ggtraff.ru/123?keyword=biomedical+engineering+colleges+rank
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9af4731c-8818-4acb-9bf3-10b202c99c0f/camp_walter_johnson_denton_nc_number.pdf
    • https://uploads.strikinglycdn.com/files/a1f55be1-de13-42b6-ae3b-8424bef48783/adobe_acrobat_pro_dc_crack_serial_number.pdf
    • https://uploads.strikinglycdn.com/files/a7e41924-906f-48db-9fb0-b1bc0b0d296d/24942205951.pdf
    • https://uploads.strikinglycdn.com/files/9fba609f-f8c3-4ab0-bd90-9c40e6488391/vorusedorixetefawenuj.pdf
    • https://uploads.strikinglycdn.com/files/99345e48-7c3b-4f96-b5de-4846b4c26241/nicet_level_2_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/b44b0f2e-5aba-4803-a0f1-12b3da8d37ec/mono_red_tron.pdf
    • https://lawetujez.files.wordpress.com/2020/11/xixobimewupedarowedewuk.pdf
    • https://toxuzan.files.wordpress.com/2020/11/nuvejofisamuwosifiripula.pdf
    • https://uploads.strikinglycdn.com/files/2e00eaac-c92b-49ef-a42f-b0e6cf362b67/300zx_service_manual_free.pdf
    • https://uploads.strikinglycdn.com/files/a1dbe5eb-3dc9-4383-a770-dbe5a7259e13/13193997229.pdf
    • https://uploads.strikinglycdn.com/files/76f22056-bcd2-40f7-b1fd-c5bf479cd467/moximevunopowemofigatapo.pdf
    • https://pubosepiko.files.wordpress.com/2020/11/tp_comparaison_agrosystme_et_cosystme.pdf
    • https://uploads.strikinglycdn.com/files/172d699b-224f-480c-8fb6-82d235a6a739/46398752146.pdf
    • https://judepikewen.files.wordpress.com/2020/11/33559174730.pdf
    • https://uploads.strikinglycdn.com/files/8e7b39e3-64c3-4a5e-8999-7234f5e09b13/27288802577.pdf
    • https://uploads.strikinglycdn.com/files/6efc19ad-2db7-486b-bacb-e3b45e8b74e1/dujojodukuderujeluzopin.pdf
    • https://uploads.strikinglycdn.com/files/673d38e4-2f30-47cc-96d1-7fda52824d17/costa_rica_gun_laws.pdf
    • https://uploads.strikinglycdn.com/files/2325043a-fdbb-48ca-8aba-674fbc6b5752/janafetokezewefonapodub.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_off00008083.bin
ae31805dcd6995747619dc7cba2c37cf0412b018dc1bea0888c0252bf6cdda6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 5372 bytes
font_01_sfnt_off000092af.bin
a6face1c9788895ff0e5218e5e1c0748fbf02abee28ea62b2ca1ffd5b9c7ffaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AF 11516 bytes

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