Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbabe52389de1e05…

MALICIOUS

PDF

43.6 KB Created: 2020-09-16 23:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0209a805f0a985a09f10844d96a865ea SHA-1: 334cc69ff5bf92d7e66bbecbe5900d92f293ed3f SHA-256: dbabe52389de1e051f53af6ee881f3c14a248d5922d0fecd9317c3b2d5e40d92
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=open+enrollment+2020+california'. The document body, though partially corrupted, also contains this URL and text related to 'open enrollment 2020 california', suggesting a lure. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with the first being 'https://f62f8cb5-62d5-49ab-96f4-d1ba69492d9e.filesusr.com/ugd/4aae87_6dbd75d5659a4d03bfd4938a456e84c7.pdf?index=true'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=open+enrollment+2020+california
    • https://f62f8cb5-62d5-49ab-96f4-d1ba69492d9e.filesusr.com/ugd/4aae87_6dbd75d5659a4d03bfd4938a456e84c7.pdf?index=true
    • https://113b5b62-a2f7-45bc-82cf-ba602d8fa8c2.filesusr.com/ugd/bf0735_f5b3514b04b44ef79e3d93f9cb999cec.pdf?index=true
    • https://ce94d720-675f-4bb2-a5bf-c76f96be7744.filesusr.com/ugd/3bcfef_c7fe6ecaeb2344da9100a2445809de31.pdf?index=true
    • https://89c8f6cc-c674-4952-953a-c151319104ec.filesusr.com/ugd/668a47_71dd9d2cecee4c3a83d058493e9cc6b6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/muzup.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/brucellose_oie.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/assembly_language_programming_8086_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2633/files/roxelogosotokupivojidifam.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/99531024746.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/3495885051.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/gimoret.pdf
    • https://cdn.shopify.com/s/files/1/0462/6907/1511/files/xarovosiva.pdf
    • https://eec1d889-bf61-4be7-856c-d2a9fc091142.filesusr.com/ugd/f95141_e17e20c50b7d4025b5894e5ef722c2ed.pdf?index=true
    • https://7b33439e-7bf8-4702-bc96-e24a08751545.filesusr.com/ugd/c0fca2_c00f17b18a194ee580256abedca62845.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b8a.bin
d0bcc3224ab238476c76afce5645a05d97dbca48fa2341d10c6067a148e10ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8A 5284 bytes
font_01_sfnt_off00007d6a.bin
e596b2ec78acbd415b370f5dd17d31190df692e39782a709292bc07ce3a3dba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6A 10748 bytes