Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa2779b1f795142…

MALICIOUS

PDF

33.3 KB Created: 2020-08-13 06:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ac545c721c0a3721857b2101cf235c SHA-1: cc7bb8b5117ab18cdaab241301decfed560dd541 SHA-256: 5fa2779b1f7951428666b2930ab45fb6a471e90200d0a5cac60851e2db20cc9a
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The embedded URL 'https://ttraff.cc/pify?keyword=all+present+and+past+tenses+exercises+pdf' is a key indicator of this malicious activity. The document's structure and numerous external PDF links suggest an attempt to obscure the true malicious destination and potentially engage in SEO manipulation for malicious purposes.

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.cc/pify?keyword=all+present+and+past+tenses+exercises+pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.misskatrinasballerinas.com/uploads/1/3/1/6/131606256/sajuneduto.pdf
    • http://files.asana.dayafoundation.org/uploads/1/3/2/7/132740204/2496316.pdf
    • http://files.mylifesaparody.com/uploads/1/3/1/0/131069934/f2e8f3f43ea327.pdf
    • http://files.rootsdesigncompany.com/uploads/1/3/1/6/131606431/7097172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/22790173171.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/kenatirarati.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0440/files/wozogapufa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/assinatura_digital_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/24253974531.pdf
    • https://cdn.shopify.com/s/files/1/0435/7246/1727/files/susenibunap.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/87318835390.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/luxosapisizidegazad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/57529370819.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/tafsir_surat_al_waqiah.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/79249420544.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000455c.bin
3625baa04f2134e86a04dbdf509fba2af1f41b3950cb85f85af9437e45b10554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x455C 5204 bytes
font_01_sfnt_off00005719.bin
30a30651bb76694f6c6182252f6e356963b1ffec4758b78c06f72419d4e0d083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5719 9720 bytes

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