Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a833dfb4bd3327…

MALICIOUS

PDF

33.9 KB Created: 2020-09-17 07:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7456c6e6f771749e07f0e57ae3a48230 SHA-1: 3b19fc62d7b718f43ff682d0b58e2e6fe948ed11 SHA-256: e3a833dfb4bd3327786d1448d701c830c22082d5e1b496d0ec67c5b653c1938c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as a worksheet answer key, which redirects to a known malicious domain. The PDF also contains a large number of links to external PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.me/wix?keyword=honors+chemistry+gas+laws+worksheet+answers
    • https://cdn.shopify.com/s/files/1/0470/9761/0390/files/zurudunadafugexoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/introduction_to_mass_and_heat_transfer_middleman.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5084/files/xabuzidawaxukadijine.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/famexevivaberijog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/45258702853.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/leroxibexalotitigapazo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/alape_bucket_sink_stahlform_412.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/retained_earnings_balance_sheet_example.pdf
    • https://cdn.shopify.com/s/files/1/0479/9456/8863/files/lurigibepo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8553/files/zumudulokomubufos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/ntp_server_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/3194/4602/files/pexowupifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/mebomasexadogegedifuvuvaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7023/files/chess_board_game_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/15966373789.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004755.bin
771f7e630d214eb05dc40f3c8c2fed0032b18bc293113486d5dc52bcee2a82b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4755 5432 bytes
font_01_sfnt_off000059b9.bin
38ce8b30f80ce2bf0a6ba9cd555bd205ecdabeb3ea05457525eb084ee68e1f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B9 9628 bytes

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