Malicious PDF — malware analysis report

Static analysis result for SHA-256 426b17c4eb984e67…

MALICIOUS

PDF

33.6 KB Created: 2020-08-27 19:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a47408979ac40d6bb759dc72c6ec4a SHA-1: 69c187ea4e26c136133885a481acad6784ba5d42 SHA-256: 426b17c4eb984e670cd6e2c390581f01845dfa7827779ff810f298d694237c09
152 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=nike+sb+tre', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=nike+sb+tre
    • http://files.bowsforshow.com/uploads/1/3/1/4/131455475/zazewo.pdf
    • http://files.undercoverquilts.com/uploads/1/3/2/6/132695321/xepofid.pdf
    • http://files.rothbartnorthshore.com/uploads/1/3/1/3/131398374/nedetegeribopog.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/39937482921.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/97379607661.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/bartolinite_aguda_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0440/9019/6133/files/79603119808.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/85447096120.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/19162884917.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/s3_bucket_cloudformation.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/badminton_regras.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/esc_angina_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/lanizude.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/88181666597.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_off00004715.bin
8cafa90c6c4d5a3b54a8ecb050bc3db5f3c78650841690c7e9bf406d823292ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x4715 4612 bytes
font_01_sfnt_off000056cf.bin
d29a5d65ddc5ac749e3156ea47e9300cce52b41ba5bc55ed14ca8c0b67fb643b
pdf-font-stream PDF embedded font (sfnt) at offset 0x56CF 10320 bytes