Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9547fc45533cbf3…

MALICIOUS

PDF

36.7 KB Created: 2020-09-16 14:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0221f4f768b5aa88509cbac6081ff708 SHA-1: b35b42f3d3d3e5924be53bf66b0753b247f7194f SHA-256: c9547fc45533cbf30b11be7dc187f0852557ecc5c4135161684cd16c3cdcf575
150 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to a known malicious redirector, ttraff.link. Additionally, it contains a large number of external PDF links, suggesting a link farm designed to direct users to potentially harmful content. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL.

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.link/wix?keyword=le+chatelier+worksheet+doc
    • https://cdn.shopify.com/s/files/1/0466/2670/1477/files/nurabulemupitikotit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2342/files/app_addict_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/inkscape_to.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/26947539534.pdf
    • https://cdn.shopify.com/s/files/1/0463/4014/5313/files/edit_documents.pdf
    • https://cdn.shopify.com/s/files/1/0436/8996/7781/files/tuboradonixova.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/fusufubatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3917/0466/files/nurada.pdf
    • https://d522f231-4497-4808-acde-c6e31d81f580.filesusr.com/ugd/296484_55d5a13ee5e04ede80a7fdc248ae9113.pdf?index=true
    • https://b2a275ef-d8fc-45be-887e-d24385b2b59b.filesusr.com/ugd/3be48b_a77aefb405dd49409d4fd8bcdbd806c5.pdf?index=true
    • https://ec164c95-8d2a-4c4c-b9fb-86d54b674c81.filesusr.com/ugd/3ed902_c81ecfc5e82f464391b72c57b4e3a3e5.pdf?index=true
    • https://7c23d88e-b939-49fe-aa98-1c151e070308.filesusr.com/ugd/a2de88_216198db90a14b539c0958f87339d896.pdf?index=true
    • https://81175baa-3830-4166-bffe-9bd1b87f352a.filesusr.com/ugd/eb6612_664921a5dd144860a9b488292b3f9f94.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/0410/6651/files/ripozasagakowalatutop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/abertura_de_capital.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mavadusuwavofemikedoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3814/files/zixavelujegazigitofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8732/1505/files/kevidazolibujixuzafakef.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_off0000520c.bin
54cadc8cfc5c1aa62509bcf9685d5ad290a461f0e4e212616235099c6e6c9ca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x520C 5124 bytes
font_01_sfnt_off00006385.bin
b6fcc4dd27df1168cd87f698bfd1079374374f26f4475a97e67c22f5b1bd2e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 10096 bytes