Malicious PDF — malware analysis report

Static analysis result for SHA-256 5455bf7ccba21512…

MALICIOUS

PDF

45.0 KB Created: 2020-08-14 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2500acdfa9b64f4bb919d85c5453a3e8 SHA-1: 7b4e9e0d1bf435f5647afd872118ca5850c1cbf7 SHA-256: 5455bf7ccba215127ee7c880288979c02681b47f5bd591f65e7aeadfe494ae8f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farming and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=home+farm+primary+school+colchester+ofsted+report, which likely serves as a redirector to further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct execution behavior.

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=home+farm+primary+school+colchester+ofsted+report
    • http://files.helen-richard-hamblin.com/uploads/1/3/1/6/131636654/2790394.pdf
    • http://files.boydenschoolpac.com/uploads/1/3/0/7/130775475/matif.pdf
    • http://files.melissamakesmoves.com/uploads/1/3/2/6/132682882/77f42994ba7ac99.pdf
    • https://cdn.shopify.com/s/files/1/0436/4815/5806/files/3993173123.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/niritiloxonesemepakusiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2154/9217/files/isomerism_in_coordination_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0440/1856/5278/files/holt_mcdougal_larson_algebra_1_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/bavuzomenufivom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/probability_sample_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/bf199_transistor_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/lisugejebejop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/pageluloreka.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/71683318899.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/memozemafalo.pdf
    • https://cdn.shopify.com/s/files/1/0448/4261/4946/files/jetajawexefa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006242.bin
995ec33957675dfb7c40143e4bca0385fc6ec6c685447dc4498c22d0309ab47d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6242 5140 bytes
font_01_sfnt_off000073c4.bin
0efd2a9942ef8ac65fd797816781f2e713b01bd2bc72bdb4462a00f17ed741b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 10272 bytes
font_02_sfnt_off000096d3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 4324 bytes

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