Malicious PDF — malware analysis report

Static analysis result for SHA-256 178ce5083aa67993…

MALICIOUS

PDF

33.4 KB Created: 2020-08-14 10:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd1d75f588c28d74c8e4d0e4b6e6db3 SHA-1: 5e0dc2d3b120cdc8e6760875a92cc5ab626f3bed SHA-256: 178ce5083aa6799385703cda65d999c8ef699190b3fcaf06e934ee32d986748c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, https://ttraff.ru/wb?keyword=boilers%20notes%20pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.ru/wb?keyword=boilers%20notes%20pdf
    • http://files.madisomeone.com/uploads/1/3/1/0/131070604/b71c838.pdf
    • http://files.jacquelynharris.com/uploads/1/3/1/3/131380539/9165943.pdf
    • http://files.amorehairdesign.com/uploads/1/3/1/8/131857117/3506377.pdf
    • http://mulal.timeundertensionwellness.com/uploads/1/3/1/4/131482952/wosina-dogukovomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/long_armed_squid_creature_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8313/7178/files/48370417682.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/pitorigazobojisokezike.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/espn_live_nfl_scoring.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/foburakezakamivoretagug.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/didaxakotinevebud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/bugegipulexizopa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/sjogren_s_syndrome_pathogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/antecedentes_personales_patologicos_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/37807526529.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/diripisizerixepaz.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_off0000478c.bin
547349fcad50dc1ad72fd6209b25cf8591b4f9be0d918f7ca1518396cb87dedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x478C 4876 bytes
font_01_sfnt_off00005830.bin
cf27de758effa7279b9de845f66541ff323231f2b73e29184e2d99a4b39f8f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5830 9660 bytes

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