Malicious PDF — malware analysis report

Static analysis result for SHA-256 647603360f6f190b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 02:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50399351cf955ece909401546b01dcf7 SHA-1: ccbaf5bf11ed877d9056d3507a67eb11885c34aa SHA-256: 647603360f6f190b4c6b6814aaabbb56d934134d36b9d0a4a77b2400af733355
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to a 'kenmore bread maker recipe book' lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the primary redirector. While the document body is heavily obfuscated, the presence of multiple embedded links, including those pointing to Shopify, suggests an attempt to create a link farm or distribute malicious content. The ML classifier also strongly indicates maliciousness.

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/wix?keyword=kenmore+bread+maker+recipe+book
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4899/8811/files/android_studio_file_browser_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/48447793282.pdf
    • https://cdn.shopify.com/s/files/1/0436/4815/5806/files/65720360608.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/tafsir_alquran_bahasa_melayu_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/pazidiwit.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bf6b409ea74fed8cf0887e40321912.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc5af717fbec44a4afeaf0e248db6d4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbed24747424c868d89aeb25c9ee842.pdf
    • https://static.usrfiles.com/ugd/b8c837_50f07d5ac3c04be4a92b94ca5ad66941.pdf
    • https://static.usrfiles.com/ugd/b8c837_20775a07d23c47a4853c4a598388468e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a6b509b4aa4e8f9cbc3fd8b936a2cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_779f679d34cc4bf49bc449e7b4a11641.pdf
    • https://static.usrfiles.com/ugd/b8c837_c932da8cbfff4b2c87b6b42a055f64cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ccdcf60cc234c24b1c3d8642978bc34.pdf
    • https://static.usrfiles.com/ugd/b8c837_885af6201ff048b087ed5d83db6c7ee1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9811fecbd72c48fd95458bf410519333.pdf
    • https://static.usrfiles.com/ugd/b8c837_45196fe3485d4e7aa8fe48fa926bbd1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_99eb1d5955ec42d695d8d57107b57c72.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_off00005fa1.bin
570419a408cd2b1a0b9b00f748ee62f624c62160f5f79f0cae310b8547ce3a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA1 5184 bytes
font_01_sfnt_off00007121.bin
7df5d4100fa19c1ab2160fdcaebcf5105abd608c0da185c1e0751be12cca5696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10440 bytes

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