Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef5dc19d742228d…

MALICIOUS

PDF

39.6 KB Created: 2020-08-21 20:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 557555f5ea235d67efb6a1a9b4ff0374 SHA-1: 652d94782dd90bca282f2cf6692585d21b7feba1 SHA-256: 6ef5dc19d742228d752820ee8bc668eb49fbac329e53d82e9bc430e7ca695598
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the URL https://ttraff.ru/pify?keyword=bairava+video+song++starmusiq is associated with malicious activity. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests a large number of external links, many pointing to Shopify domains, likely part of a link farm to improve search engine ranking for malicious content. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

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=bairava+video+song++starmusiq
    • http://files.capricecrawford.com/uploads/1/3/0/7/130776776/e85cf84bf10ea.pdf
    • http://dujifom.corkscrewcollectors.com/uploads/1/3/1/6/131637316/mimibeluvusubidome.pdf
    • http://files.carlosamrhein.com/uploads/1/3/1/1/131164024/74177bd13b17f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/akama_miki_and_zhang_muyi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/astigmatismo_regular_e_irregular.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/56404256485.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/votosarabobuwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6635/files/43136354303.pdf
    • https://cdn.shopify.com/s/files/1/0429/7107/0617/files/ruwaru.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/thus_said_zarathustra.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/57548471107.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/22891026799.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_off00005b68.bin
ca9f4fa64fc0e6f92c2fc4dac738d7e456ca60fd645d3267e480c92d44e3a80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B68 5348 bytes
font_01_sfnt_off00006d80.bin
417513c9de4747b0b58961368aa9a9b831338eaef116794be7c09902dc10a575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 10720 bytes

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