Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c26eff714c23569…

MALICIOUS

PDF

35.7 KB Created: 2020-08-20 06:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca966f7cb022a61f1e8a4baadf4d4697 SHA-1: ffcca629dd68dff2d6523813a715fffb948d9f41 SHA-256: 2c26eff714c23569411b31e1ec3fcbb263ef2fdf36ae3fec69b09ca0087ada44
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. A critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, indicating the primary lure. No scripts were extracted, but the presence of multiple links and the redirector heuristic strongly suggest a malicious redirection attempt.

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.com/pify?keyword=amelia+bedelia+goes+camping+worksheets+free
    • http://files.buttfarm.co.uk/uploads/1/3/2/7/132741352/zimem.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/karipedirevebixogavapital.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/gudatetetosevebedufiko.pdf
    • https://cdn.shopify.com/s/files/1/0459/6875/2807/files/catholic_super_balanced_performance.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/tafebek.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5185/files/pipekawiwabomatitakifo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/zigofazuwavopil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/nomulojikakigevezoxax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/gegegixefobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/company_profile_samples.pdf
    • https://cdn.shopify.com/s/files/1/0446/6517/6217/files/catatonia_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/43650165575.pdf
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/bovoxime.pdf
    • https://cdn.shopify.com/s/files/1/0450/3774/8382/files/developing_strategic_thinking.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/vonarifawitijanogavakaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/46739129701.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_off00004a97.bin
90165e556234e1b30d908b114ead901ea6a214946047769a69b32fa3d65ccd41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A97 5856 bytes
font_01_sfnt_off00005e5e.bin
a7511829ab54f9d90d19b58a828b49753f2c80e7d06c5da966b23da3adbeb260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 10364 bytes

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