Malicious PDF — malware analysis report

Static analysis result for SHA-256 0baa93c07a21e411…

MALICIOUS

PDF

39.7 KB Created: 2020-08-20 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2914f9f6d31aa95477c89b31a498846f SHA-1: 732b70bdf11cc320f5c4130e8bff7399408fb599 SHA-256: 0baa93c07a21e411e048735cfcd56b22fd2570035a670e53cebd6226460712bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. 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=sociological+theories+of+education+pdf
    • http://files.paleowithstyle.com/uploads/1/3/1/6/131637385/517582.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/gazulagifa.pdf
    • https://cdn.shopify.com/s/files/1/0436/7240/4118/files/1284890681.pdf
    • https://cdn.shopify.com/s/files/1/0452/4012/3552/files/working_with_functional_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/86111973157.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/83034086662.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/56683257588.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/62887960971.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/69797567319.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/d_d_5e_vengeance_paladin.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_off00005d15.bin
36514770413c3dc6927e370677f0b9e26f5a324647b8c827f5aee8463b4ab517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 5520 bytes
font_01_sfnt_off00006fc4.bin
bf977e1d661b0d02899ca43ff87629e8c3993b4a6b7a6f0cc4278160d23ec585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 10012 bytes

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