Malicious PDF — malware analysis report

Static analysis result for SHA-256 6555b4b3af746e7d…

MALICIOUS

PDF

44.4 KB Created: 2020-09-07 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ac8bc94356ae85fbeff61d67fe886a4 SHA-1: 66bd07fa77e0f041358f1c5ef27a488dcd06e5fa SHA-256: 6555b4b3af746e7dd479ff48aa51391ce3ca9ef23a14c378c5ba4338f8887a75
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to a harmful site. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a lure to download further content, potentially a second-stage payload.

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.club/wix?keyword=blast+off+to+reading+teacher%2527+s+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/12860477299.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/30712024378.pdf
    • https://cdn.shopify.com/s/files/1/0440/5323/3814/files/56999908739.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/corporate_finance_by_ross_westerfield_and_jaffe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/83603707072.pdf
    • https://static.usrfiles.com/ugd/ced2dc_a4e31e0679c34bf28ec64e4e4b76302c.pdf
    • https://static.usrfiles.com/ugd/909b15_430143c94d67472c87d1d654a99d9808.pdf
    • https://static.usrfiles.com/ugd/2486b5_31bb80f2feec47e5b62e4f436c85ad53.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d11b6247966490d9a33fece389ace91.pdf
    • https://cdn.shopify.com/s/files/1/0463/5797/1105/files/double_comparative_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/brazil_vs_croatia_tv_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_089a8b38dd1e4c93b8bcb36319bd1e76.pdf
    • https://static.usrfiles.com/ugd/0df15e_25711f1a05ab4ac58bf726cb33faa42a.pdf
    • https://static.usrfiles.com/ugd/a3b54b_b994782df85146e2a6ededae872812a6.pdf
    • https://static.usrfiles.com/ugd/bd1c09_45aa9a6b99b240888672f6b948d654e5.pdf
    • https://static.usrfiles.com/ugd/63022f_a09bc9d572e0408c815590b63d5ced13.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_off00006f7b.bin
29475cc2614d70cfed8adc8f74ad81cf4b3d8f7d54f0d8ce366b8926cd831ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7B 5368 bytes
font_01_sfnt_off000081be.bin
fad6f6aa88aa545303e79076b9573802b4caa7e8b515e071b20faa5b6b3a1040
pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 10068 bytes