Malicious PDF — malware analysis report

Static analysis result for SHA-256 354b681b27db7024…

MALICIOUS

PDF

34.7 KB Created: 2020-10-29 18:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 616572d4e8b614e67fad751900336367 SHA-1: 0eb69f883ec9a8887643df1b766693288ffa6711 SHA-256: 354b681b27db70249a5368f0143070b86d62f0063db6da1fecfaac8520081f81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent URL, https://cctraff.ru/strik?keyword=night+shift+richard+meyer+viola, is identified as a malicious redirector. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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://cctraff.ru/strik?keyword=night+shift+richard+meyer+viola
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fefurorobumi/801209319.pdf
    • https://uploads.strikinglycdn.com/files/abb5ec8e-be00-4456-9b04-1edf7a047965/26748754957.pdf
    • https://s3.amazonaws.com/fasanag/50298657767.pdf
    • https://s3.amazonaws.com/sinadi/ulta_beauty_application.pdf
    • https://uploads.strikinglycdn.com/files/5d473f92-3e92-415b-8d39-2ed23f63154a/73427460878.pdf
    • https://uploads.strikinglycdn.com/files/8341b343-ac36-4f9e-8786-f7ddf9e35f37/anova_reporting_table.pdf
    • https://uploads.strikinglycdn.com/files/167d2ab3-9476-412e-8a46-aeec8b20c7be/92018268834.pdf
    • https://s3.amazonaws.com/sugowubuf/search_inside_yourself_ebook.pdf
    • https://uploads.strikinglycdn.com/files/593efcf5-7444-4cf4-94c0-efdcfd472136/guretenotikoleraxuduped.pdf
    • https://uploads.strikinglycdn.com/files/655df5b1-c356-4e56-bae8-8ecaae5e0fde/tm_cua_trai_s_hn_c_h_tun_hon.pdf
    • https://uploads.strikinglycdn.com/files/b70d5f35-a427-4f00-bad6-0b37de4b9a3c/baboxakalajomisoxulujasiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8069/5462/files/parker_condensate_pot_installation_guide.pdf
    • https://uploads.strikinglycdn.com/files/72a45e40-229b-4177-b592-dabf75e0959b/89152473965.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004db0.bin
0668451e8c368fcb07ee540edb67f30ba0371d058cb76896df6294fb4e39a548
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB0 5568 bytes
font_01_sfnt_off0000608f.bin
6862bb1b420226eb4010afb240579c9db4749f1097b2c86e9d55fc1cbc519529
pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 11956 bytes