Malicious PDF — malware analysis report

Static analysis result for SHA-256 171af8772a772c7f…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 07:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765b6d91c3a14ebc9c781fa6efdf4c6c SHA-1: 797083ec366869dd9de2bf887944303036de0fd0 SHA-256: 171af8772a772c7f09ec728a615e758c3625b311f0061132cd3b274101faadeb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and a redirector. The primary malicious link, 'https://ttraff.club/wix?keyword=reading+comprehension+worksheets+1st', is presented within the document body, disguised as educational content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious infrastructure, likely for phishing or malware distribution.

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=reading+comprehension+worksheets+1st
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/malibuluribu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4093/files/simple_spoken_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/4948/2400/files/minifusenupodigimet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/84091760251.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/264892144.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/ribimukajowulamubek.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/61544097516.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/wigazovapajanivoxav.pdf
    • https://static.usrfiles.com/ugd/b8c837_2977d4f4b08f41228e7cb93640987667.pdf
    • https://static.usrfiles.com/ugd/b8c837_5388bbc3b337414788e46919abaf9542.pdf
    • https://static.usrfiles.com/ugd/07e02c_aa62541177cc401194171cbd1ad38116.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cbffd95719a48abb4eb29ecff715736.pdf
    • https://static.usrfiles.com/ugd/b8c837_35c996ce7bbc47c780832eab7dd9be6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fe961d527c40e48348b34a240f6a04.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_off00006e32.bin
fc6de15f015648055312648d5932324d87d521061b1dd660e6ef48b077a89c20
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E32 5672 bytes
font_01_sfnt_off0000816c.bin
76d5e4e8fb819a70364c14f19b55db7b119894aa961d37bd225997f54badd77f
pdf-font-stream PDF embedded font (sfnt) at offset 0x816C 10636 bytes