Malicious PDF — malware analysis report

Static analysis result for SHA-256 857dc64314cef854…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 18:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9af120cfc4c2ade001a2f26794c8af8 SHA-1: 74a510d9f78077d7596e5cb565314a48f79e20b2 SHA-256: 857dc64314cef854595022f199907d3181341695a46857de965ebab5a44b8fba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=android+apps+on+chromebook+without+touchscreen', which is likely used to distribute further malware or phishing content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=android+apps+on+chromebook+without+touchscreen In PDF document text
    • http://dujafizap.manfredocamperio.com/uploads/1/3/1/4/131407406/jijejiwi_pupokafujenak.pdfIn PDF document text
    • http://files.veganvans.ca/uploads/1/3/0/7/130738955/ragezibodogezaraloso.pdfIn PDF document text
    • http://files.breakpointchurch.com/uploads/1/3/1/3/131379578/setiful.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5557/8273/files/89198769939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/68266938653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/bachelor_s_degree_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1767/8497/files/3._1_diagnostico_de_la_stps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/36556403588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/10072837707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/degabinemuzibaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/cahier_vacances_cp.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d6.bin
1b4a68a9b36e74e38d15df3ce50821d84efebbf2aa011a1724f05ddcb650c130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 5564 bytes
font_01_sfnt_off000076a3.bin
e123a8e9dac606a757851bde1e3bb5a3edbd371dc56c95163337d3e4c8cc3062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A3 10308 bytes

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