Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c79a9b7697190…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 08:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2beeb3be894ea350254d6700d7b3309a SHA-1: 5a8ddb0cd2a9de8bbff68dd12962a24185661821 SHA-256: 100c79a9b769719060687860caf355040efcc97ac64940d36f1d7be04c83c639
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, contains text suggesting a search result for a PDF, and the embedded URLs indicate a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=history+of+science+fiction+literature+pdf
    • http://files.suezn.com/uploads/1/3/0/8/130873914/tugixaj.pdf
    • http://files.darkmattercomposites.com/uploads/1/3/1/3/131398184/fatuvoguwovimob-xoxoxetivon.pdf
    • http://files.annemckeestoryteller.com/uploads/1/3/0/7/130775002/b935ccafc61a89d.pdf
    • http://files.amoebasisters.com/uploads/1/3/0/7/130738955/wofadimokiw_dimebapowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9824/7069/files/ggplot_reverse_axis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/32388810369.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/ikea_catalog_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/windows_7_hosts_file_location.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/xilatokomagubonif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/42508180489.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/creative_writing_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/acoperamantul_maicii_domnului_acatist.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/chemistry_periodic_table_of_elements_with_names.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/south-_western_federal_taxation_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/60531638385.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/letusovujevuge.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4551/files/63406532193.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_off000069a2.bin
bbc713bac8cecc63c0d4b04c60798889863272f7108af8c3646c575f5f757879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A2 5212 bytes
font_01_sfnt_off00007b78.bin
91d9a4565ade53e9bb7c4ea0005eb4f666562f16c2b4303aa8926e69db27f59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B78 10012 bytes

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