Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bf5b332c72d453…

MALICIOUS

PDF

43.5 KB Created: 2020-07-08 23:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a8387a6d7d4572edb3241e69b05bf05 SHA-1: bfaff7658fb0c982b7b809122e9033e63177f39a SHA-256: 81bf5b332c72d4533520f4f7404ccc71247b1662e8007f534d304caa252e5385
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, identified as a link farm. One of the primary links directs to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=kacang%20hijau%20pdf'. The document's structure and extensive linking suggest an attempt to manipulate search engine results or to distribute a payload through a chain of redirects and further PDF downloads.

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/wb?keyword=kacang%20hijau%20pdf
    • http://files.eatsugarsalt.com/uploads/1/3/0/8/130813409/galekazasobubimepux.pdf
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://files.miniaques.com/uploads/1/3/1/4/131412858/5706513.pdf
    • http://files.cowgirlfaithbordercollies.com/uploads/1/3/0/7/130775215/6c2382.pdf
    • http://files.kentuckybaskets.org/uploads/1/3/1/1/131164204/zizidefunajoko.pdf
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdf
    • http://files.oace.co/uploads/1/3/1/3/131381781/parotakime.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.woodlandsfrenchies.com/uploads/1/3/1/3/131383553/buvomagedax_dopiriveluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://navemikeg.files.wordpress.com/2020/07/8846114139.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/raziwavuzebojunir.pdf
    • https://letevotiva.files.wordpress.com/2020/07/raminolupuxi.pdf
    • https://vupovinenese.files.wordpress.com/2020/06/81754112917.pdf
    • https://fejomiburiwe703791076.files.wordpress.com/2020/07/jitatizimevolurudulekini.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.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_off00006cda.bin
08756c4643a9f5459cd0c428e3ddc36d3977063bf571747d8e22d5e3eb6a64fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 4732 bytes
font_01_sfnt_off00007ce8.bin
dabd087d8507584f89f11657d7d7343590af889619224c14732da2bfcb30a444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE8 10188 bytes

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