Malicious PDF — malware analysis report

Static analysis result for SHA-256 105f3c46f9ac3724…

MALICIOUS

PDF

44.8 KB Created: 2020-08-20 20:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af079b0a617e9f7ca7a9280fe2a627f SHA-1: ba72c587732dcbe2324c8557e9a89df371603a86 SHA-256: 105f3c46f9ac3724250e7459a979368df2e77516d500d0938d1462298b1c4a61
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a movie download, which leads to a large number of SEO-optimized PDF links hosted on Shopify. This indicates a link farm or redirection scheme designed to drive traffic to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=wrong+turn+7+full+movie++720p
    • http://wosev.maritimeclassics.com/uploads/1/3/0/8/130874197/sojug.pdf
    • http://files.inkfishltd.co.uk/uploads/1/3/0/7/130776368/faxorufedalakat_kugonadike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1979/6643/files/github_read_point_and_figure_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/33007410973.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/engineering_drawing_isometric_projection_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/zavubelodawebufuvizijeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdf
    • https://cdn.shopify.com/s/files/1/0447/1911/2345/files/basic_linux_commands_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/analytical_and_logical_reasoning_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/alert_document_cookie.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/87601693159.pdf
    • https://cdn.shopify.com/s/files/1/0437/0127/2729/files/51924008432.pdf
    • https://cdn.shopify.com/s/files/1/0430/5233/5255/files/10795330027.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_off00006f60.bin
5d1ded0232986b6d8c2ff64a8660f8a39ebb33d10fd76a6355f63184c3abec77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 5260 bytes
font_01_sfnt_off00008153.bin
741d40c13efae6d1d392679061b8c402eb173dca7c075984bd7b31462151be9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 11272 bytes

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