Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a0ac6225fc5f27…

MALICIOUS

PDF

52.5 KB Created: 2020-07-23 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e11fed60c85b4e04d3d9c3f338670c SHA-1: 268814611227b3a7888ff70d827c913d343fe107 SHA-256: 66a0ac6225fc5f27c5914710d633d14217445d3f61781a7d8d882f4501855c3b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One of these links, ttraff.ru, is a known malicious redirector, indicating an attempt to lead the user to harmful content. The document also features a large number of links to external PDFs, suggesting a link farm or SEO manipulation tactic.

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=list%20of%20all%20css3%20properties%20and%20values%20pdf
    • http://files.mobile-mower-fix.co.uk/uploads/1/3/2/6/132695543/zigovel-difim.pdf
    • http://files.stcroixtech.org/uploads/1/3/1/4/131438180/sujodav-mavekopavoxof-xudewefume-zetiw.pdf
    • http://files.nicholasluciusart.com/uploads/1/3/2/6/132681885/gexabasidufo.pdf
    • http://files.fabiolaborgesdecastro.com/uploads/1/3/0/8/130874495/2920860.pdf
    • http://files.haleythestoryteller.com/uploads/1/3/0/9/130969184/5042667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9168/0666/files/newavedof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/tenovowawulajewilene.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/maribix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/76722332257.pdf
    • https://povodijagez.files.wordpress.com/2020/07/revul.pdf
    • https://tokatoxosi.files.wordpress.com/2020/06/wagagaxoj.pdf
    • https://lukipidize.files.wordpress.com/2020/07/vutadajepovenevoperivib.pdf
    • https://vasoponox.files.wordpress.com/2020/06/43007988150.pdf
    • https://xujeveva.files.wordpress.com/2020/07/fofigoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/dizepumekeduzajisitovefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/fomumovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/rugasilagaxegozox.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/kerawogetivajotodafusow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/88848056968.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/11591534168.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/71387884245.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_off00008d80.bin
a60c92c668b834dfebb0d26ed5df1e1ffe2f0ed992ca209cf12f469dd7823881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D80 5196 bytes
font_01_sfnt_off00009f34.bin
210bbf0c0f92412739afa36ef065201dbaaf2e6b7fd6450838b14c78ceed94c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F34 10796 bytes

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