Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeee46bcbc1c648…

MALICIOUS

PDF

40.8 KB Created: 2020-08-25 12:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5d02f51df14850d0c4c861a7b97edc SHA-1: 759e749f69542a68cc1d9e62d7759012e1af31e0 SHA-256: dfeee46bcbc1c6483e9d38cd04c8f759d05cf258cf7b2051075bb80a73c067b3
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the string 'carpenter job description pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=carpenter+job+description+pdf
    • http://nikipume.julialye.com/uploads/1/3/1/3/131384709/1751076.pdf
    • http://vumorafew.stalbansdavenport.net/uploads/1/3/1/4/131437502/xiganatibezoxi-fagena-jogabudif-zegojum.pdf
    • http://files.climbtocollege.com/uploads/1/3/0/8/130813876/2618300.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9528/files/89471179347.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/c_file_b_ngc.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/15734923378.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/72591382720.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/28938065461.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/sistem_reproduksi_manusia_kelas_xi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2163/0631/files/pavugufoxoreda.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/putuwana.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_off00006176.bin
af39c9b47a46b452eced5f394647d23cf72c2b42a01845a4fcd067c8904256d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6176 5240 bytes
font_01_sfnt_off0000734f.bin
8cd5eb2ac70af864ee70b7908cb44d91f58910c3dc692a2bf63569a6e4ece0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 10428 bytes

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