Malicious PDF — malware analysis report

Static analysis result for SHA-256 e743b6bcaeea4cfa…

MALICIOUS

PDF

42.8 KB Created: 2020-08-20 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f5835e3f354cbac3ca84dd23942acbc SHA-1: 9696162173792555b7c5684ec02481f6602bfa1f SHA-256: e743b6bcaeea4cfac92a346f6e29d58c87ded79d7ea37f2bbe4e050eebd9cc30
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The embedded URL 'https://ttraff.ru/pify?keyword=descriptive+research+design+quantitative+pdf' is the primary indicator of malicious redirection, while the Shopify URLs represent the link farm. No scripts were extracted, limiting the analysis of direct payload delivery.

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=descriptive+research+design+quantitative+pdf
    • http://files.crosstimbersmsband.com/uploads/1/3/0/7/130776393/marozawuweta-livimazen.pdf
    • http://files.hocwt.com/uploads/1/3/0/8/130874338/leguxuroxozesanes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/kuripavabegulumosaxurifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/kijowedanedatesubugube.pdf
    • https://cdn.shopify.com/s/files/1/0433/3302/5960/files/34144905846.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/13201016632.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/bimuwine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mizamolapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/40351147963.pdf
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/firosirepanukevixobebepik.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/83977038317.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/97588381835.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/find_surface_area_of_triangular_prism_worksheet.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_off000069b2.bin
7e75205245c09035fbdf49f06102e46d9d6af989090325cc4c5d234394cb1b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 5568 bytes
font_01_sfnt_off00007c9b.bin
802bb4a36c8543e9306d1e5717788c210db280577133123a242f536bf4a10623
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9B 9824 bytes