Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c37f3af805c3d68…

MALICIOUS

PDF

41.2 KB Created: 2020-10-20 10:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d2325d9024b819278f2ea2b3d86101 SHA-1: 23c39d1ecdb5c78c396163f8ab8274645afef036 SHA-256: 9c37f3af805c3d68ff13ca8eef76ee4f33c4cc66c2a7dc1de68d0ee131fefc3f
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a Gmail login prompt, which is a common phishing lure. The PDF also hosts a large number of other links, many pointing to Shopify, suggesting a link farm for SEO poisoning or distributing malicious content. The primary malicious link identified is 'https://ttraff.link/123?keyword=se+connecter+compte+gmail+android', which is likely used to redirect users to a phishing site.

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/123?keyword=se+connecter+compte+gmail+android
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8b6a8b321ce.pdf
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f89bf888c8a7.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8e8dc9dbc68.pdf
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f89614d28e15.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f870f69743b9.pdf
    • https://cdn.shopify.com/s/files/1/0480/2091/4335/files/alkaline_food_chart.pdf.pdf
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/dodibujomadipufarona.pdf
    • https://cdn.shopify.com/s/files/1/0266/8937/2329/files/li_apktool_recompile_khng_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/compare_and_contrast_articles_of_confederation_and_the_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0266/7944/3654/files/thorme_de_la_bijection_rciproque.pdf
    • https://cdn.shopify.com/s/files/1/0476/9021/9686/files/five_nights_at_anime_2_online.pdf
    • https://cdn.shopify.com/s/files/1/0496/1091/6003/files/characterization_of_polymeric_biomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0500/0190/3766/files/operation_manual_of_plastics_injection_molding_machine.pdf
    • https://cdn.shopify.com/s/files/1/0484/9834/4097/files/wow_vanilla_blacksmithing_guide_1-300.pdf
    • https://cdn.shopify.com/s/files/1/0496/1527/4147/files/unidad_2_leccion_1_gramatica_a_answers.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_off00006044.bin
eca544458615a1653a721da2c7d1de6b54e069383b6f8c644998b7ea2409dce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 5320 bytes
font_01_sfnt_off00007231.bin
fcc79d40ec334b93b692695133ae290c699a70db66bb1a0e922071a1a3c9b922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7231 11320 bytes

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