Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bff651961cf03f2…

MALICIOUS

PDF

43.1 KB Created: 2020-08-10 08:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46027e931143a0f8096b0e59cab1eb94 SHA-1: 9959b17b33a28a261c7c89f3fb3e5b48461d4657 SHA-256: 7bff651961cf03f2ca52e3fdb4df4ada1b1e667f4a4704b3a66b9fd903258478
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a bushcraft PDF, which leads to a large number of other PDF links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the embedded link points to known malicious infrastructure.

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/pify?keyword=bushcraft+101+t%25C3%25BCrk%25C3%25A7e+pdf
    • http://files.limitlessptny.com/uploads/1/3/1/4/131438538/difek.pdf
    • http://files.philadelphiahappenings.com/uploads/1/3/0/7/130776720/9579335.pdf
    • http://sasikar.escdu.org/uploads/1/3/1/8/131872225/lopusesudovegola.pdf
    • http://files.matusnursingreview.com/uploads/1/3/1/4/131438216/rufaliziweninazeben.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/laboratory_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/puzegagala.pdf
    • https://cdn.shopify.com/s/files/1/0429/4498/7292/files/65062855490.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/gusepu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/64872725905.pdf
    • https://cdn.shopify.com/s/files/1/0437/9607/0560/files/bikegom.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/wirikogogadimogasuzedugi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/89045111259.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/ems_field_guide_bls_version.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/mawekupepufi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4804/9572/files/onii_chan_dakedo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066bb.bin
db6545218ae5b97c0e417024092ca7e620d8b529a3b772b80ee552df994c036b
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 5820 bytes
font_01_sfnt_off00007a0e.bin
b52e0e9153dd1862839bb633efe4f2e6c5978015e728de3b209e1d1cd31f2bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0E 11388 bytes