Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df6baed7e11b49f…

MALICIOUS

PDF

64.3 KB Created: 2020-08-19 03:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c57588f1570675ab6a9cadbeffde578 SHA-1: 4092a61c18fed852058eabff0dfced3d4817d5e3 SHA-256: 8df6baed7e11b49f8ec630903f4ac6b9c67228cf9944bf34d1e7311fc44c6ce2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=types+of+architectural+drawings+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=types+of+architectural+drawings+pdf
    • http://files.fracturedwood.com/uploads/1/3/0/9/130969330/6831174.pdf
    • http://files.nokillhuntsville.com/uploads/1/3/1/4/131455883/jalupi.pdf
    • http://mefelim.adventuredayspetcare.com/uploads/1/3/1/4/131454165/tegaguwem.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/e_500_2004_chiltons_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/mulurar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/14432592541.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/kuremubewaneliva.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/mejoxaremun.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/habitos_alimentarios_en_estudiantes_universitarios.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/dufojegedagidipenuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/57189644775.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/kijiseditowanebukudofol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/65364305468.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea7.bin
bd346271b08153f8d127bb24fdf36428f5da8b3dd697c28f63a1646359806573
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA7 5560 bytes
font_01_sfnt_off0000d1a9.bin
0240ff398853b25cae5e52890f217dbb010c0866c0a3bd1dea4a70fbd576d5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10076 bytes