Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d67fdfc8291a989…

MALICIOUS

PDF

42.4 KB Created: 2020-08-07 07:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a614097f7207576ee810365b668818e SHA-1: 1be83a7704c438b3423f827c79b828c3844e0c6b SHA-256: 7d67fdfc8291a9898a277a83e02d08c073f3af39a93e40cfe5442481d7cf19c1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and a lure related to 'animals and their homes pictures pdf'. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests a link farm or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=animals+and+their+homes+pictures+pdf
    • http://files.natureswayhealthfoods.com/uploads/1/3/2/3/132303239/2d946e7.pdf
    • http://files.zenwich.us/uploads/1/3/2/7/132712325/nejot-ridaxagefosagi.pdf
    • http://files.annaghmore.net/uploads/1/3/1/8/131856743/4683218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/56380795672.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/display_json_data_in_html_page.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/54979198701.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/lenupumababedek.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/40674844651.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/71080569153.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/typing_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/physics_formulas_for_class_11_and_12_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9441/files/59237803088.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/kenuwomova.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/puladedu.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_off000067f7.bin
ddb0820303fa7ca2305d753e22f084ec15d7d44ccda4b0c93f7dae654585263d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F7 5384 bytes
font_01_sfnt_off00007a18.bin
56521c18d378321e5e94831566948ecf87764348712bf33992b5fddc1fc2d0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A18 10556 bytes

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