Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cd4f9c519e7ad5…

MALICIOUS

PDF

64.3 KB Created: 2020-10-25 06:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4c74eb160d13eda5d027154ff5d84f3b SHA-1: 96c53147a40fa991f9a76ce178ca9e4b98fc49cd SHA-256: d6cd4f9c519e7ad5e3f1f22ef0997bab4703601840f0580832931ff5cb67af02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains URLs that are also present in the heuristic findings, suggesting a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?keyword=did+poki+and+fed+break+up In PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/bipudomu-zovexolapagiso-bosadaseki-pibib.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/5300225.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/nifan.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/3421492.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7304884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5f93843ea2166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f92ef3074bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f8acc0d14a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f91069761a07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/nowonovege/46286246981.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/49052862183.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/31091019961.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/fekesenoweketi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xosakag.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/authentic_happiness_ebook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/basic_spanish_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/fajeweru.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/guzisadopaz.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/13532444985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/mimidunakurenutuvuvafif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5443/1893/files/mesulezudekexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9580/2527/files/1496040538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3876/1109/files/newige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8571/8203/files/61772519399.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EB 5028 bytes
SHA-256: f6ff90972a70a47b31a787fd70012b73e80333c895c56c56e5af349a2da0b94f
font_01_sfnt_off00008413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8413 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00008f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F76 15568 bytes
SHA-256: 67b8aacba118e7349549929d47c060a427b65bc55724f0e6d1bbb9607a0a1819
font_03_sfnt_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 16300 bytes
SHA-256: f7187374289544a7b267d5e9e6f3b77239684810a0949911d1d6bc7d3311df60
font_04_sfnt_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 8560 bytes
SHA-256: 44dac7361b9ee6c06010b7e0ff8c760dd8c081169c1a1d308bbd2723fe9b4369