Malicious PDF — malware analysis report

Static analysis result for SHA-256 19781fe42eec64d6…

MALICIOUS

PDF

47.8 KB Created: 2020-08-21 23:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c0310da0adc40c403c6531d6d53932 SHA-1: 8db39e7847484988c2c149b2bb80d908e13669ed SHA-256: 19781fe42eec64d66f8b03eb9e6a7190798cefdb6a04faa531dab57b7cd401b2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure.

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.cc/pify?keyword=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+background+video+recorder+%25D0%25BD%25D0%25B0+android
    • http://xifiti.marciejbronstein.com/uploads/1/3/1/6/131606289/degiv-kiweduxar-bejitufusam-pafuxaworuso.pdf
    • http://vomov.circularfood.net/uploads/1/3/0/7/130775403/3954c8.pdf
    • http://files.southamptonotars.co.uk/uploads/1/3/1/4/131453255/354c817c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/1778/5759/files/cell_biology_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/6967298588.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/98483134047.pdf
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/86689557792.pdf
    • https://cdn.shopify.com/s/files/1/0435/7314/9859/files/povenufazaduwigodow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/nagogozetefuwezabanutinot.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/building_construction_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/canon_picture_style_editor.pdf
    • https://cdn.shopify.com/s/files/1/0439/5725/6350/files/47857062568.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/17996955470.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/kingdom_hearts_2_iso.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f9.bin
532412f84d8c825a40469722a4a8336a82802d364fa6262bcd124146040ef2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 5760 bytes
font_01_sfnt_off00006abe.bin
dfc15a2522778537de0203aed089d774c6c9f8ba87dbfc9c9c8eb084536ed925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 15212 bytes
font_02_sfnt_off00009a42.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A42 16092 bytes

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