Malicious PDF — malware analysis report

Static analysis result for SHA-256 23551e5a0a714778…

MALICIOUS

PDF

37.7 KB Created: 2020-09-17 13:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c8d92739b5af0ecc976b600444fe37 SHA-1: 979e232dfd4caf3e045fe22f85109bfba5abb799 SHA-256: 23551e5a0a714778862a246be3a172ea88a0e06ee5a9b9cadec447fa8ba8c6be
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at 'ttraff.club'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=stoichiometry+problems+1+worksheet+answers', suggesting a lure related to stoichiometry problems. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple unknown-reputation URLs further supports malicious intent.

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.club/wix?keyword=stoichiometry+problems+1+worksheet+answers
    • http://koropu.k12gamer.com/uploads/1/3/0/7/130740596/c84a7d865f.pdf
    • http://joxize.sagecanyonpta.com/uploads/1/3/1/6/131636746/dovatulirivabogutem.pdf
    • http://wazalan.authorajknight.com/uploads/1/3/2/6/132680813/ganoju_rufures_bezuwugixan.pdf
    • https://cdn.shopify.com/s/files/1/0436/4635/3561/files/proformer_sheet_metal_brakes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/wofaziwakoxejenidipukiwet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/u-boot_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/livro_ansiedade_3_cimes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/asian_art_history.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/gunerumok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/41099860992.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/kexogorefajukawuwi.pdf
    • https://705ecd82-ade5-406c-a43e-d82a1ec59b6b.filesusr.com/ugd/77941b_aab1caca1eca48dd85651572b4078fbd.pdf?index=true
    • https://a1bc42b2-6d86-456b-9623-a00ad7805edb.filesusr.com/ugd/f08e01_7ec4d03de11e4a60ba401b0d66244bcb.pdf?index=true
    • https://4dfa10d0-a9b3-430d-aafa-c6410fb9f819.filesusr.com/ugd/370ea2_efd52d90fcd949c28d2b6d7eb67f4849.pdf?index=true
    • https://97d5a181-57a5-445b-9091-a0549926250c.filesusr.com/ugd/3bca44_797011d4586d485681f08f7505384f73.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_off000053e8.bin
907301377e747640f6494441467eea4720d83d6dc382ea88ec47182e13d8c417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E8 5724 bytes
font_01_sfnt_off00006758.bin
919eb4e417f1a9b7cedf71f26ac21cefac3dd3ed2ec5f3a26997f954c1f47e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 10068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.