Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec17b161b434bd3f…

MALICIOUS

PDF

50.0 KB Created: 2020-09-01 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c7f79238bb8be3f76756ef51311b4e SHA-1: 705772eaf3a25dea2e7c488f34d8a11afef33f99 SHA-256: ec17b161b434bd3fdfbb5cd7c96de2553a13dc2355cf538cab5174be6b68de1a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=annuity+business+mathematics+pdf', is designed to redirect users to potentially harmful content. The file also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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.cc/wix?keyword=annuity+business+mathematics+pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/31895039974.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/vinugijanazimidaredej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/scaled_agile_framework_4.5_download.pdf
    • https://cdn.shopify.com/s/files/1/0462/7959/0048/files/wegivokogotarugan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/91134519197.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/64462994743.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/disufopigewazotera.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9946/files/komivatosojegajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/mirulukilojumet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/11468079371.pdf
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/fidevagamofofavuxipixovub.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/pelajaran_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/65508932204.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/calculus_limits_at_infinity_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000734b.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734B 6744 bytes
font_01_sfnt_off00008433.bin
20db54203c2a664706925e27ec8c11c17731f5fe213fa672635129aba0b08a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8433 5500 bytes
font_02_sfnt_off000096c6.bin
d8abb842eec4497de89fd9fee7c968d2b56440d514b5f3db7795400eaa7b9fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C6 10676 bytes

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