Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faa7ba5b7fb2e49…

MALICIOUS

PDF

56.6 KB Created: 2020-08-22 02:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6208e4251ccddd6f80089f85bd8f0044 SHA-1: d0e25ad3bc1d279d30b2d2ea7a4724a1e7c13018 SHA-256: 6faa7ba5b7fb2e492a8e71baf40309873d47ddd090ca52732be9278e129bb913
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.ru. This suggests a link farm or redirection tactic to obscure the ultimate malicious destination. The document body, though heavily obfuscated, contains the malicious URL and references to financial topics, likely a lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.ru/pify?keyword=sformu%25C5%2582uj+cech%25C4%2599+podzielno%25C5%259Bci+przez+25
    • http://files.gracewinchester.com/uploads/1/3/1/6/131636655/puwulaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/9999/6569/files/bitijisebawusobemotafedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/32542844513.pdf
    • https://cdn.shopify.com/s/files/1/0428/9206/6975/files/zawawavedivoxivowutujimog.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/54780639352.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/pokimegetofakaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/stock_market_basics_for_beginners_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1999/files/ninewunitugere.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/calendar_2020_festival_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/72350990639.pdf
    • https://cdn.shopify.com/s/files/1/0440/9131/0232/files/verifica_analisi_logica_seconda_media.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/wow_girls_login.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000829a.bin
2b484a8f42e8f152a476ef349f1e7b0b5d93a75eb40feba831741646dcd80782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 5932 bytes
font_01_sfnt_off00009676.bin
7ee88a7ef026f19f0318bd648186f5e877c65dce8cf3638121f98cdbb386eaf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9676 12200 bytes
font_02_sfnt_off0000bdce.bin
58ddc94b67e0355b4f295b70f79b21e00ca1312f79f820a038979a253bff27eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 16196 bytes

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