Malicious PDF — malware analysis report

Static analysis result for SHA-256 811d450a87a7630d…

MALICIOUS

PDF

40.9 KB Created: 2020-08-25 04:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25debad435ef5ee45baeaaf2460289e7 SHA-1: 0d30ea7a793a15818590f3f53c35e8c3a57554d0 SHA-256: 811d450a87a7630dd46687b442baf3ead0019acf340be0c3537a3be13dc460ff
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, suggesting an attempt at SEO manipulation or link farming. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to 'jamestown colony worksheets pdf' and the tool 'wkhtmltopdf', indicating a lure to disguise the malicious links as educational 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.com/pify?keyword=jamestown+colony+worksheets+pdf
    • http://files.aliarkady.co/uploads/1/3/2/6/132681164/ponopiluneros-tinisirurogav-saxiwid.pdf
    • http://files.slightlyaskewwines.com/uploads/1/3/0/7/130776602/a3e2f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/types_of_behavioural_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/fodumalaxefuzutagugiwugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/76664317667.pdf
    • https://cdn.shopify.com/s/files/1/0454/6029/1742/files/assembly_language_programming_basics.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/scert_up_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/87476045918.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/34682449252.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/moxerifedemafagebosuvitob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/insuficiencia_renal_clasificacion_akin.pdf
    • https://cdn.shopify.com/s/files/1/0466/4999/9525/files/fuxoj.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_off000061d7.bin
1bafe11a3354e27716fa89c9ff7d42d005e6abdc3e73053fba16b92005cba293
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 5640 bytes
font_01_sfnt_off000074f1.bin
3bda86058de98898a162ce7af8c16e3c51699452d312a5d6a98743321933071f
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F1 10040 bytes