Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5acf1d1a11d8a6…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 22:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19590a52f442d78ab19fe7ad1932fe86 SHA-1: dc2d4e4fcc223f22ea313ff56ce01e6ef01dfe4c SHA-256: eb5acf1d1a11d8a6491b760fb8a050ebb24ada673f46e8a93fa330c162ad840c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or redirection strategy. The primary attack pattern involves luring the user to click on the malicious link, likely leading to further compromise.

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/wix?keyword=ipnosi+tecniche+pdf
    • https://cdn.shopify.com/s/files/1/0440/6486/6469/files/71831787891.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/budget_constraint.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/87853600085.pdf
    • https://cdn.shopify.com/s/files/1/0437/3889/0394/files/star_alignment_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/counter_strike_go_dedicated_servers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/vocabulary_words_with_meaning_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/apa_style_research_paper_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/solimabovavigopes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/35195056524.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/heartbeat_childish_gambino.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/wumezozirewozojiwoxivotob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/subulosesalajigufi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e41.bin
209515793381d8360d9648b5ab7897e1c2c5c48749aa9521b59ed910e641dc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E41 3240 bytes
font_01_sfnt_off000069ce.bin
82f4b2e3f043349a59b27256f7d53132ad52011f28022e341b5628bf91fb4cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CE 4844 bytes
font_02_sfnt_off00007a44.bin
927bd7f4cb4550cd8079e97a87b46037a96719443aa932fb969c5e20bcb3dd9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A44 11280 bytes

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