Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8547e3794ba4f58…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e26ce1d3aea95fef9ce382f4a74b8e1e SHA-1: 04d8e13ef9ba5da447708d1a5a437c821ac115d3 SHA-256: b8547e3794ba4f584337c9c4331c6052e07b56b502fbdc38727edd47ba629def
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/wix?keyword=don%2527t+starve+glommer+statue', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=don%2527t+starve+glommer+statue
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/17967688814.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/13238550472.pdf
    • https://cdn.shopify.com/s/files/1/0435/2399/7856/files/pamanukizasodofovivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6189/5587/files/nazosuwezogitabobilow.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/xodaborivilaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/chromatography_principle.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/free_singapore_math_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/full_body_isometric_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0430/5833/1799/files/mvc_layout_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/accident_reporting_at_work_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/24876667330.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/12441260933.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628d.bin
4406948322e2d871bd72a8b2d5efe6a35ca2d131126efac31e4862e7b976da8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x628D 5100 bytes
font_01_sfnt_off000073e1.bin
c9556c97bab656bcbf58dc8e5c20c006473fced80681ac197e15e716a0c5c6bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 10380 bytes