Malicious PDF — malware analysis report

Static analysis result for SHA-256 6590e87aa7564897…

MALICIOUS

PDF

40.0 KB Created: 2020-09-17 12:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af4694544882aa40f2f3c9104bb329f SHA-1: f15833a8de3135a50d371504670cbeceae205492 SHA-256: 6590e87aa756489732ea7a6dddb698e81876ec581f77115052aed01934c87fbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, contains text suggesting it is related to worksheets and includes the malicious URL. The presence of numerous other PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. No scripts were extracted, but the primary malicious finding is the redirector 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.me/wix?keyword=thank+you+mr+falker+worksheets
    • http://files.islandgemcreations.com/uploads/1/3/1/3/131381539/e458903966e.pdf
    • http://files.millworksart.com/uploads/1/3/0/7/130740625/2023764.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/62885385001.pdf
    • https://cdn.shopify.com/s/files/1/0433/1480/6937/files/sbi_credit_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/xojaxotepaniwemuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/connecting_math_concepts_independent_worksheets_level_b.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/938784411.pdf
    • https://bdb26303-795b-42bb-8b26-c88a16b42170.filesusr.com/ugd/1e52da_a3cec294a23f441b91f700d24026f2b2.pdf?index=true
    • https://2aa0281e-6f77-4f2a-9a89-59f775a397cb.filesusr.com/ugd/f2ef67_cbd0c19fadad49ccb1be6a3466a0b016.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/4361/7959/files/44370619702.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/xevugodidukilupele.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.pdf
    • http://www.readwritethink.org/classroom-resources/lesson-plans/digging-deeper-developing-comprehensi
    • 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_off000056c8.bin
f44256161c1b5774668dbc14122f9eeb8c3b5fb44ae777b210d9038a6c41ae44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C8 5216 bytes
font_01_sfnt_off00006873.bin
71c693fdd6930175e32e8c977014bdbff1e7af7853fd8c3ff1f7424a0a596ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 13964 bytes

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