Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef71f5204f531df…

MALICIOUS

PDF

41.3 KB Created: 2020-08-12 10:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d6ef98d124c387cd077a4c4b6f983eb SHA-1: 88030b06c939c72fb33a8a13e67a3dd57f07ad7f SHA-256: 9ef71f5204f531df6a00abf2bc8d8c7b3376250276069dc9f32f6ca4b5fc6097
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=esl%20list%20of%20irregular%20verbs%20pdf'. This indicates the document's primary purpose is to lure users to this malicious URL. Additionally, the PDF was identified as a link farm, containing numerous external links, many hosted on cdn.shopify.com, suggesting a broader campaign to distribute 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.cc/wb?keyword=esl%20list%20of%20irregular%20verbs%20pdf
    • http://files.ranbykw.com/uploads/1/3/1/4/131482819/23a29dddbc05aac.pdf
    • http://files.dkgwa.org/uploads/1/3/1/1/131164474/6795a6cc8faffd.pdf
    • http://files.convergence-state.com/uploads/1/3/0/7/130738559/e9695ef84d.pdf
    • http://files.athospress.com/uploads/1/3/2/6/132695734/faliditewora-jemogi-poxijosoril.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/84053911605.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77084518355.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/alter_ego_b2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/gisudibavevokava.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/sakizeninakesedikosiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/edema_pulmonar_neurogenico_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6421/files/acetone_formula.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/91637569263.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/87654059158.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/6669466053.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1344/files/bcom_books_saurashtra_university.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/44452345412.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_off00005d64.bin
2d88511ff0f93d61838a503c7e75a2b99453e306d40b34475299d85e2545a092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5368 bytes
font_01_sfnt_off00006fb3.bin
3e75962fdabbb43de069ebdaf987e616ee45095d1ab010e3a58f82465f7ac4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB3 13004 bytes

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