Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a40761f4ba86a07…

MALICIOUS

PDF

47.7 KB Created: 2020-08-23 14:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bbb3d2292afe6afd77b494f22d04d49 SHA-1: fe60b7fe7bdcb388ab32f428219c98d5d1a09e29 SHA-256: 4a40761f4ba86a0797ac095a7ce873ca67537466a910b260c791c5476ad832e7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is part of a link farm or SEO poisoning campaign designed to redirect users to malicious infrastructure.

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.cc/pify?keyword=neoplasia+endocrina+m%25C3%25BAltiple+tipo+2+pdf
    • http://files.westvlietstreet.org/uploads/1/3/1/4/131455621/539db79fba74.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/kptcl_je_old_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/rudofsky_architecture_without_architects.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5650/files/kefiwemelenilesazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0710/files/chrome_extension_instagram_photos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/gofominikulomebegiviwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/broadlink_rm_pro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/involuntary_manslaughter_model_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/41157945434.pdf
    • https://cdn.shopify.com/s/files/1/0440/8115/2152/files/leetcode_number_of_islands.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/narasimha_swamy_kavacham_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/biology_book_12.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/xarija.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_off00006df4.bin
153b483b1adab56593c0a52f636bb7a3273f0bae098179679bd1989be5decfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 5516 bytes
font_01_sfnt_off0000806b.bin
3afe0c30c9a1444e450df3321e9df94f683cf274e4b75deec2ba310b360900fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 15576 bytes

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