Malicious PDF — malware analysis report

Static analysis result for SHA-256 646840af3a7415c4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 06:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9dbddafa28d7e1480f4cce2f6823f77 SHA-1: fe985bef730a6643c9de71cb13bea6e65af727bf SHA-256: 646840af3a7415c47635cd474eaf777592a9febcd91c178c3a181af66d31f0fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to distribute malicious content. One prominent URL, 'https://ttraff.ru/pify?keyword=bacterial+growth+rate+pdf', is identified as a malicious redirector. The document's structure and the presence of these links strongly suggest an attempt to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=bacterial+growth+rate+pdf
    • http://kisazosuf.stopanddecide.com/uploads/1/3/2/8/132814930/8352b27354c5146.pdf
    • http://files.chaletalpemassif.com/uploads/1/3/0/7/130775679/vikokof.pdf
    • http://files.marker99.com/uploads/1/3/1/4/131453429/rijijovopu.pdf
    • http://files.wfyouth.org/uploads/1/3/1/0/131070866/fcc58.pdf
    • http://files.venicefloridacorvettes.com/uploads/1/3/1/4/131453021/7d85b851bd67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/ketonumepunivivijuzago.pdf
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/60864265564.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/kijebagexateda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21086069096.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/aparato_locomotor_y_sus_funciones.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/57494116258.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/kefiwomekalanadivorewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/bukimufizonolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/levowolumofug.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/rovalemekowadapevoxiruvaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/xulepipatinuxepimukite.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006755.bin
91861f6ac71584e3085ffb5d6a03e977226e4415c1ff4f6153624183ee12c689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 5060 bytes
font_01_sfnt_off000078b0.bin
7c0fb63cbf6593551d7e0d441b4263f9065c10b9ce1ad7c8b154d77f9f255c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B0 10076 bytes
font_02_sfnt_off00009af7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF7 4324 bytes

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