Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8368dd908df2ef…

MALICIOUS

PDF

68.3 KB Created: 2020-08-08 19:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ea5d35d75c5d0125a888518b2f4065 SHA-1: 1fc581c4d5e5646b0d284c8ab08a170bfdcc9c61 SHA-256: 9c8368dd908df2ef387eb02ac1c12a2d4e1a50d900c8e706453c5e8bcd051369
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 at 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'Retinopatia hipertensiva fondo de ojo pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious distribution campaign.

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=retinopatia+hipertensiva+fondo+de+ojo+pdf
    • http://files.scotokensprings.org/uploads/1/3/1/3/131383619/damuwote_tefusibexafin_nadadituteguka.pdf
    • http://files.hustondemskyproperties.com/uploads/1/3/1/4/131452841/rupuv_vofuranawe.pdf
    • http://files.hopespringsvenue.com/uploads/1/3/1/4/131406507/wakik.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/90911978695.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/24117459216.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/482493952.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/xapajavakizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/bursite_tratamento_fisioterapeutico.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/homelite_240_chainsaw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/13239428291.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/gepinexeporubaxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/fusionner_2_1_page_sur_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/applied_hydrogeology_fetter.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/pewasofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/79534728367.pdf
    • https://cdn.shopify.com/s/files/1/0429/8076/9951/files/660210316.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_off0000caba.bin
ef5b9fc33ef2233fa379066506367d8c3fed56e2b82978d97f14022430531fd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 5240 bytes
font_01_sfnt_off0000dc96.bin
7aec59579d59e8ade6f9d3085705635f5e560fb8c9064f4d372e38b13323d6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 11664 bytes

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