Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f51d427890bb91…

MALICIOUS

PDF

46.4 KB Created: 2020-08-06 05:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9659aee7759433765e9cfa1a89f631a2 SHA-1: 9c58131af452b907d2f56864b1593191624ffad5 SHA-256: 18f51d427890bb91fc10779af64a5b924728f4ca4f5ca3f5e5cd04217e6a38a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, a technique often used for SEO poisoning to drive traffic to malicious sites. One URL, https://ttraff.cc/pify?keyword=altes+land+d%25C3%25B6rte+hansen+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=altes+land+d%25C3%25B6rte+hansen+pdf
    • http://files.otlbuildingcompany.com/uploads/1/3/0/8/130874016/4721705.pdf
    • http://files.hannahpomante.com/uploads/1/3/1/8/131856706/6812345.pdf
    • http://files.zferenovations.com/uploads/1/3/1/3/131379868/2be2747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/givomaranuguzaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/noratuvuxuraxor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/wilafolavum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/vijojebirifebevam.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/rofivaketalofeliti.pdf
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/rexozusunut.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/sixobifawemufekorulilosuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/powelomijujozomakediza.pdf
    • https://cdn.shopify.com/s/files/1/0430/1514/3587/files/3842815990.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/sowolibixirewelupube.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/cursos_de_ingles_intermedio_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/zaliwupiwirubijanupizuna.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/96737021075.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_off00006d52.bin
107016e3a2a98a0d82fec5f4798cb776d30bc57bf4b58e12173dc25dd15abd86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 5256 bytes
font_01_sfnt_off00007eee.bin
6c9a919cfed7c37de971a3f41c383b83247d3fba95a56199f68859a1b1e8b4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 14388 bytes

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