Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30d43ff5dbd7623…

MALICIOUS

PDF

37.2 KB Created: 2020-09-22 00:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f368c8c015e0c10de59f2f8cd92476 SHA-1: b1068d8854093103ef1ccef27737e8b81c776a33 SHA-256: c30d43ff5dbd7623c27861c7e8e2351c8a0dc8b2700d1e389a408aedf6cc7edb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=recetas+ecuatorianas+con+pescado'. This URL is presented within the document body, disguised as a recipe, to entice users to click. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign content hosting sites, but the primary malicious intent is driven by the redirector. The ML classifier strongly flags this PDF as malicious.

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.link/wix?keyword=recetas+ecuatorianas+con+pescado
    • http://files.jasming.co.uk/uploads/1/3/1/4/131454034/3417533.pdf
    • http://tamuve.revibeyourself.com/uploads/1/3/0/8/130874002/gadinoranad_kejadedi.pdf
    • http://files.jilljonesyoga.com/uploads/1/3/2/7/132712163/zilel.pdf
    • https://cf8ca5d2-a6e9-48b8-8707-87bb59e7aa8a.filesusr.com/ugd/98857b_97ce59d881394921bd9bf80a2809e0e8.pdf?index=true
    • https://3eba878f-38de-49e1-880b-d9e3813b19ee.filesusr.com/ugd/278743_836928f7d2d242b6ae76c015786967d6.pdf?index=true
    • https://af259263-4fee-403a-802b-d2dd0cbe41f9.filesusr.com/ugd/4f92c1_b4b646030f724adf9c222fdf6ac28853.pdf?index=true
    • https://30645440-05f1-4580-9a85-581f818e8f16.filesusr.com/ugd/8a4248_e3f9f45627694ff89159acef780ff12b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/basic_haematology_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/doxabi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/mensajes_del_agua_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/83569670186.pdf
    • https://306220cc-7400-4cc9-8706-df5f86953410.filesusr.com/ugd/18f527_8793bf276f324d86a7ee7b856b45fa7a.pdf?index=true
    • https://a770fefa-4757-4b2b-b549-93b53524106c.filesusr.com/ugd/0e2875_8c98b09639d34058993aabf0672301fd.pdf?index=true
    • https://fe0b5d70-272a-4b8b-a16b-564e23684f83.filesusr.com/ugd/4329d7_79f993d9864646d388616037cfdd863e.pdf?index=true
    • https://bb87eb2b-030b-4c1f-ba94-09ab052e0d4a.filesusr.com/ugd/238140_848665458cef476ba8b18d9a88c4275d.pdf?index=true
    • 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_off00005368.bin
143cbf5df8d882ff7e4043d4a767f6dc8497fd2e6bfbb5e556528ac3dd280f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5368 5044 bytes
font_01_sfnt_off0000649f.bin
f5c1bf20981dfc5e880339b1a9e0ee25a650e2700527677748d85fdd645dd081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 10316 bytes

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