Malicious PDF — malware analysis report

Static analysis result for SHA-256 84653938c04ab62f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 09:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75f14be982a1990652e918a4fd0b4085 SHA-1: dc70656992967510ffd39b4a77ebc5dcd9f79928 SHA-256: 84653938c04ab62fe3809b6a8c0727c207fa42ca33e8fe4a6e98ae5c3b422ae1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness, and the embedded URL heuristic confirms the presence of a suspicious link.

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/wb?keyword=table%20tennis%20rules%20doubles%20pdf
    • http://files.planters.org/uploads/1/3/2/6/132681342/9888388.pdf
    • http://files.mendednest.com/uploads/1/3/2/7/132740804/1229706.pdf
    • http://navomuner.newmorningacu.com/uploads/1/3/1/6/131606289/60af981a7d2b133.pdf
    • http://files.maryjoyceart.com/uploads/1/3/1/3/131379567/sojow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/bcg_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/putugoxuwipirogokikoxigew.pdf
    • https://cdn.shopify.com/s/files/1/0438/0151/0045/files/62614639863.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/16219155343.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/nutricion_enteral_cuidados_de_enfermeria.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/44799081698.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/loxeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/rotuzokelubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/dotadogofewejitatajodeti.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/39100109656.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/fallout_76_fusion_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/79925892185.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/tenosoxogijek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/public_private_partnership_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/13073695904.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_off00007117.bin
87ea864d1c9d555435a5e88b7f74311b3dd66268cd0c4d0444651b42b6dcbd52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 5124 bytes
font_01_sfnt_off0000828c.bin
241554adedd384370e0f6934c96c34707876f4f2849b3e5431f891ad490ca3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828C 9980 bytes

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