Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d05cb0a3ae8ae7b…

MALICIOUS

PDF

54.9 KB Created: 2020-08-15 07:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0761fbf96ab183eef24d40f1f07ea43 SHA-1: 7f6eb5f3ef2d03ebe3c70063efda123f58c00d20 SHA-256: 0d05cb0a3ae8ae7bbb3b31ef333489a21b5bb8085fa4fb8ef5b3ee85bd5f4ed9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which are designed to appear as legitimate documents but ultimately lead to a malicious redirector. The primary redirector URL is associated with known malicious infrastructure, suggesting an attempt to direct users to harmful content. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=carl%20zeiss%20microscope%20manual
    • http://ziset.medisurgeltd.com/uploads/1/3/0/9/130969723/rivude.pdf
    • http://files.theflightproject.org/uploads/1/3/2/6/132682882/nefezadom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/venujufukijatozazesof.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/brain_cancer_journal.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/wuxupabijojob.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/calliduscloud_cpq.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/ffx_dark_valefor.pdf
    • https://cdn.shopify.com/s/files/1/0439/0790/7752/files/american_english_file_2_second_edition_workbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/rugumu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/19965437568.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/lopubefukixipifituma.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/98736287880.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/pawimiperar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/71287292126.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/liwavel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/gakumosaturesaforinagat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/fokipuligasosameje.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_off000097cd.bin
f604f794a8b4e82ca531a5a2bce3612f861f45a7de7f8e0e9c517840a941eab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CD 5032 bytes
font_01_sfnt_off0000a8d8.bin
5f1d0ef269f71378279f7d21d1225b5a4cfa875c6e57d1eb377b062997235175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D8 11404 bytes

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