Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf24c1d30ab7678…

MALICIOUS

PDF

38.1 KB Created: 2020-09-19 18:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227a3d6f6cd43eb1d8f0114ec7cd6431 SHA-1: 179c4f0ae240598071810a6abb8485496516fe35 SHA-256: cbf24c1d30ab7678609726590fa30d697a4e5840796b1cc077a9eee9715631a6
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=exploring+new+horizons', which is also listed as a malicious redirector. Additionally, the PDF contains a link farm with 17 external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The primary malicious IOC is the redirector URL.

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=exploring+new+horizons
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/analfabetismo_en_latinoamerica.pdf
    • https://cdn.shopify.com/s/files/1/0450/2241/2958/files/awesome_god_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/28022799729.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/zowezerujatofida.pdf
    • https://025e7775-c79f-48bb-9daa-884db6ea1fb3.filesusr.com/ugd/bfd504_ef4a03d2d4c942c28df99da1a9aa34de.pdf?index=true
    • https://cb5dcd5a-3b32-4256-8ef6-47cabe817b80.filesusr.com/ugd/1d64af_1e8e815f7a1049929f7d4d711791cc53.pdf?index=true
    • https://7eaf5882-95fc-469c-9609-be2e4336923b.filesusr.com/ugd/4a2613_8d8b1db063944f5283800192c57ed90b.pdf?index=true
    • https://12d50a9a-0ab6-4d19-9ab3-62c4b63e7ce8.filesusr.com/ugd/f51585_66f3be6768de422e830a47dbaea20892.pdf?index=true
    • https://7ae7a34a-eab4-4b49-b34b-5f433c2ed5d7.filesusr.com/ugd/197ed4_363cba848dbb4a98b13eb0d5a9c35ffe.pdf?index=true
    • https://57fbe3ed-5a67-465b-b601-8aadf297ffde.filesusr.com/ugd/9d869b_d633bc9b6fd54c71b95d172c6f08bf52.pdf?index=true
    • https://e75d9292-5d78-4864-a607-e2ff5a4a4173.filesusr.com/ugd/bca722_91cad72663da49fc8054fedcf7740475.pdf?index=true
    • https://b910b8df-83fd-4b84-a36b-1698fbc31daf.filesusr.com/ugd/6fd45c_10b48da4073f4bf5a69cce53bec378a2.pdf?index=true
    • https://63989cc5-eff7-4eff-bd37-5b5bef7c483d.filesusr.com/ugd/be19e1_89e6ac0230c341c497a0ca7ea366d39f.pdf?index=true
    • https://183a2a57-0f4d-4773-8f87-db7057b098c4.filesusr.com/ugd/9ea91e_8c63362e467a4c1fa64acc1079fc7076.pdf?index=true
    • https://4fbe0425-2124-487c-a12a-2f5e6c8f1741.filesusr.com/ugd/9f06f8_9952aa5b64b242d5a78dfae93a6ee390.pdf?index=true
    • https://d5caf990-1473-4f0b-b644-5bd93f0fca41.filesusr.com/ugd/e3834b_2115e64bf5504b88bedfe6d1f9b052c6.pdf?index=true
    • https://8b356145-7dba-4393-92b6-14823ec44e9c.filesusr.com/ugd/221eaa_595a1ab537d3425cbaace037fc08bdfa.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/
    • https://d5caf990-1473-4f0b-b644-5bd93f0fca41.filesusr.com/ug

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000582b.bin
c2b059c11c12fcc95ea526e37aa3aacd368769c6e94bda775d2bac798c0d5d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582B 5036 bytes
font_01_sfnt_off0000696c.bin
641cbb150156db4e9e3d1aa32b14b9c6933bc44dcbd1a76dd38d899d80e51bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696C 10004 bytes

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