Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f663e02ab7fb1fd…

MALICIOUS

PDF

37.3 KB Created: 2020-08-04 14:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a1d0a2e30d6dc04697a78db041b67c5 SHA-1: 603ccc44ab682732ad6cc42bd7ac783150666e6d SHA-256: 5f663e02ab7fb1fda2e1af63169797531f42b9eed193784956d8aaefb64f458f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO spamming attempt. One prominent URL, 'https://ttraff.ru/wb?keyword=parts%20of%20a%20plant%20worksheet%204th%20grade', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and appears to be disguised as an educational worksheet to encourage clicks.

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.ru/wb?keyword=parts%20of%20a%20plant%20worksheet%204th%20grade
    • http://files.susmanosextendidasmexico.com/uploads/1/3/0/9/130969082/4239492.pdf
    • http://files.corneliahoogland.com/uploads/1/3/2/6/132683154/ba0206be1634abc.pdf
    • http://files.sermujersma.com/uploads/1/3/0/8/130814066/f9998c4af7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/sokexisusiripajodumasuta.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/74712528100.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/86299518780.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/xajed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/26339926374.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/13488832359.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/nifixuxebabulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/91923322402.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61051106257.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/togiwamodukopazave.pdf
    • https://cdn.shopify.com/s/files/1/0436/7620/5209/files/34235381660.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/37423140459.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/nesakujikiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/91428071195.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_off000052b6.bin
dd0d616b16a5a995914683b01026fc917666590a6f091d73d16c359c47ecf83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B6 5548 bytes
font_01_sfnt_off000065b3.bin
2d92739263a604f0154ce5d8c70db70af94a063ecac904a03a37b5c54d5ab1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 10132 bytes

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