Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa479cd1c63ecb9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 12:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d2d178832c114ae2422113b9764f49b SHA-1: 59ee046f82910ca4c348caf33529d16ae130e4ab SHA-256: 2aa479cd1c63ecb97f35a47372cad69bb9c3485698b70d1c2018470823e7c476
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to external resources, a common tactic for SEO poisoning and redirecting users to malicious sites. The critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms that at least one of these links leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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/pify?keyword=grammar+and+punctuation+guide+pdf
    • http://jumarigo.lmchurch.ca/uploads/1/3/1/3/131380065/dunusukofasadug-lubojebatus-kuvenelev-kanesi.pdf
    • http://files.nectrathletics.com/uploads/1/3/1/4/131455832/2461608.pdf
    • http://files.bernadinesdesigns.com/uploads/1/3/1/4/131411199/zidel_loxuxi_koxivaka.pdf
    • http://pubon.yodha.net/uploads/1/3/1/3/131383744/4241749.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/autecology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/33913366765.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/1679450337.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/database_system_concepts_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/dukewodawoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/15964038136.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/wulawujaxokigola.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/wotibimifi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/21963537304.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/histology_of_gastrointestinal_system.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/metformin_ampk_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0452/1033/7440/files/28208370098.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630f.bin
cc83a4dfde735f5b9f320f19047cf41ded319c30dc4eb77f1cfd6df02716d4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 5296 bytes
font_01_sfnt_off000074ff.bin
6acfb16db5ead8ca5190de2103f1c0a180fb21269127eeece71cae1cb0419140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 10412 bytes

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