Malicious PDF — malware analysis report

Static analysis result for SHA-256 192b92b7142b74ed…

MALICIOUS

PDF

68.1 KB Created: 2020-08-31 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3d4d0624b11225db79425375b1fe96 SHA-1: 9ba81a908ab1bbc5fca82b1d5d0c049047bb34d0 SHA-256: 192b92b7142b74ed3d1ae87f0eacb64220d69489dbe6a6f7782dd90365ae7609
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=the+wonder+faye+hanson+lesson+plans'. This URL is likely used to lure users to a malicious site. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. 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.cc/wix?keyword=the+wonder+faye+hanson+lesson+plans
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/7041213522.pdf
    • https://cdn.shopify.com/s/files/1/0434/1694/4807/files/la_crosse_technology_manual_7215.pdf
    • https://cdn.shopify.com/s/files/1/0435/1180/8155/files/lubiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/71094653211.pdf
    • https://static.usrfiles.com/ugd/b8c837_96b2e90230c841c2ac1b7b735ba3c03a.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/3318245578.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/26215483963.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/history_of_the_mind_body_problem.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/jizadonope.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/20156401300.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/11025977867.pdf
    • https://cdn.shopify.com/s/files/1/0437/8191/4781/files/72042254960.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/menelewijimirusukudod.pdf
    • https://cdn.shopify.com/s/files/1/0439/5279/9902/files/norma_tecnica_de_anemia_minsa_2020.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_off0000cc99.bin
2dc93298e881965a6fdfe02c28ea18b17f7a0660345ec99e0822cfb1d6efaab6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 5272 bytes
font_01_sfnt_off0000de96.bin
d2213bc13f5b002a57eed91e3e4c70df5ae06aa4a8c3d1a530c3951fbf7c0e84
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10748 bytes