Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd377ed6c06fdb…

MALICIOUS

PDF

38.3 KB Created: 2020-08-14 23:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d38b46d1c047706405c6e3f60636f6 SHA-1: 63127f13732a2aabcdd7a773db5fc72334e4709e SHA-256: 18bd377ed6c06fdb5b41a7e926ac1868def9c4633eb9497b9ef20aa8302235b1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'math worksheets' and includes the malicious URL, suggesting a lure to trick users into clicking. The presence of numerous external PDF links further indicates a link farm strategy, likely for SEO manipulation or to distribute further malicious content.

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=math+worksheets+bar+graphs+3rd+grade
    • http://files.nathanbirr.com/uploads/1/3/2/7/132740378/76a563d8d5d46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/6125168875.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/48484184197.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/57627721620.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/tajekovibudasumadeso.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/65869993485.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/mezibolu.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_off00005711.bin
f4b9b663b7a3408ebeefa9396ed4f0a53d4500cda94cdbd5060a9e199bef52e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5711 5652 bytes
font_01_sfnt_off00006a62.bin
b1a4f0b1b9493a6b52b549b8ad1fc9576b0c921d2f2accbe595987e20294ea7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A62 10168 bytes

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