Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636ef87d40a6fbe…

MALICIOUS

PDF

37.2 KB Created: 2020-08-21 10:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82507361c98099dc8ffa773d4e84d427 SHA-1: 9535e410dc8d1710c51814fac7bf8137d5332d1d SHA-256: b636ef87d40a6fbe5bad32623c22709204d416a09d88f932211d9b1923b9e9c3
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, disguised as an 'Oxford English Grammar Guide PDF', redirects to a known malicious redirector at ttraff.ru. This indicates a social engineering lure designed to drive traffic 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.ru/pify?keyword=oxford+english+grammar+guide+pdf
    • http://files.balancedandbehaved.com/uploads/1/3/1/4/131437005/4559983.pdf
    • http://files.drummandassociates.com/uploads/1/3/2/7/132740553/98dea1c46.pdf
    • http://files.scarboroughanimalhospital.com/uploads/1/3/2/7/132741128/gefejorasov.pdf
    • http://files.edutobest.com/uploads/1/3/1/4/131411147/3376399.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/cgmp_guidelines_in_pharma.pdf
    • https://cdn.shopify.com/s/files/1/0464/9435/1512/files/93353284745.pdf
    • https://cdn.shopify.com/s/files/1/0434/0350/9914/files/78605084407.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/birthday_chocolate_cake_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/warhammer_40k_space_marine_codex.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/divifubefebumikinesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/awana_sparks_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/99379885566.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/68163755378.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/putir.pdf
    • https://cdn.shopify.com/s/files/1/0435/9313/8333/files/bopisevo.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_off000052b8.bin
db949db1ffd92f5dd5fdf60bbdda874aa9be1f89157a3690d21f13a89eade654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B8 5548 bytes
font_01_sfnt_off00006577.bin
76c151844c1965eed8118aceb28bdd9fff64df3036551862f964a0776f067e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 10100 bytes

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