Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0ca6b7ffe50d3b…

MALICIOUS

PDF

42.8 KB Created: 2020-09-19 03:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbca423e2f9f27858ad7201a036504df SHA-1: 7a2605f41aa7544fabd1fc4e4273fc7a38fe0b58 SHA-256: 4a0ca6b7ffe50d3b06fc0f0d34964da5c05307ad7d31d834ce0875def624e848
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm. The primary redirector URL, 'https://ttraff.link/wix?keyword=baby+trend+expedition+elx+jogging+stroller+instructions', is a strong indicator of malicious intent. The document body, though heavily obfuscated, also contains this URL and others, reinforcing the attack pattern. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=baby+trend+expedition+elx+jogging+stroller+instructions
    • http://files.vestafjelllodge.org/uploads/1/3/1/6/131637896/f935e24f75d.pdf
    • http://sarinox.castlethorpecricketclub.co.uk/uploads/1/3/2/3/132303189/52e32459.pdf
    • http://xodom.avcri.org/uploads/1/3/0/7/130776023/fegidexafanaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/89166024632.pdf
    • https://1aeeca40-6dbc-4756-be49-51db3f73378f.filesusr.com/ugd/ee6100_6c54cff78f9a4b489b1c23b1c7c80abb.pdf?index=true
    • https://5cc08f1d-5ff8-478e-834d-3b1cfd81b7b1.filesusr.com/ugd/2e4eb4_45c9a3e0056d4568baf8a27e7bd71618.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/1607/5939/files/children_s_day_songs_in_tamil_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/47294110655.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/3657667554.pdf
    • https://cdn.shopify.com/s/files/1/0437/3001/0273/files/6462200114.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/alcoholism_project_download.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_off000068c3.bin
59ea6536e256da4ff0032f0cc474fc1125ba8afc5ad8de5fab4c99a5dfe74808
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C3 5676 bytes
font_01_sfnt_off00007c2d.bin
c20b5a69050da89d441360676b2901f8fcd790a0479b4660eee46a0a93f008ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2D 10032 bytes