Malicious PDF — malware analysis report

Static analysis result for SHA-256 171a57f68026da76…

MALICIOUS

PDF

54.9 KB Created: 2020-09-05 02:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3087e63a32d16b990202560af6bfc1ef SHA-1: c0ed16cddb32ed45e8b66454bdcf91520c91d08e SHA-256: 171a57f68026da7695a32c700fd5d8700500c887eca177724f539f6d2e35133e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'kitchen utensils crossword activity 1 answers'. This URL redirects to a known malicious domain, indicating an attempt to lead the user to malicious content. The presence of numerous links to external PDFs suggests a link farm for SEO manipulation or to host further malicious content.

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.link/wix?keyword=kitchen+utensils+crossword+activity+1+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/599026_63f0f0078ef642a4b39c576fc3a63767.pdf
    • https://static.usrfiles.com/ugd/0511f5_598ae02ecf1740808039bbf59df4cafc.pdf
    • https://static.usrfiles.com/ugd/4d548e_d249389d1a45497386a4e9c73e5c4c1f.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_f941ba8c3ed2401a89396af400a1713f.pdf
    • https://static.usrfiles.com/ugd/e2b09b_ee9b7ef4f5cb4222a551aa6267de05ab.pdf
    • https://static.usrfiles.com/ugd/008e52_bb2a485709a24ec4b1f823e5bfc589b4.pdf
    • https://static.usrfiles.com/ugd/409ca8_009fbc270eca47a283609e81518c53cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_123d252e4ac64234a60ca242ca54936e.pdf
    • https://static.usrfiles.com/ugd/289c5e_7aeabaf6e1c34159a4979dadd8b7521f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7721a74e7c04820b2f17953fdbb5f10.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/75926204640.pdf
    • https://cdn.shopify.com/s/files/1/0438/2959/2214/files/jizakaxusawuru.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_off0000988c.bin
a4e448991dc515fd8a87dd5b199d7049639d3b22d4f96a48798b180acf4c90b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x988C 5300 bytes
font_01_sfnt_off0000aab3.bin
69658c7d9e83553d0d8cefbb57f68dc121b6eae2075f849dcde9cfac7674c1d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB3 10440 bytes