Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541aed598ede511…

MALICIOUS

PDF

38.9 KB Created: 2020-07-13 20:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862278808e7326086f16dcbcad1bdde7 SHA-1: b6f2f15071b92b2b40dfe1d198e1d907973ffb8b SHA-256: b541aed598ede511428aea437d5df796fb1e96e2b0df3a99f646156b2f40e5fa
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for educational materials. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection attempt.

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/wb?keyword=top%20notch%20tv%203%20activity%20worksheets%20pdf
    • http://files.yuniverse.ca/uploads/1/3/0/7/130739895/3623ef.pdf
    • http://files.thewarmingcompetition.com/uploads/1/3/0/8/130814907/5384575.pdf
    • http://files.emmanuellebeautysalon-spa.com/uploads/1/3/1/6/131636954/ecffe.pdf
    • http://files.troyathensbands.com/uploads/1/3/1/3/131382447/9c1ba00388dd1.pdf
    • http://files.yuniverse.ca/uploads/1/3/0/7/130
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/72286607250.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/83928025164.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5671/files/ruresudu.pdf
    • https://nifodixama.files.wordpress.com/2020/06/89190150512.pdf
    • https://fatugapep.files.wordpress.com/2020/07/kewozisun.pdf
    • https://wefofupu.files.wordpress.com/2020/07/51544875693.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/46977544282.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazobezosajage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/64637840710.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.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_off0000594c.bin
18513213939075c41d849e897a1e0f511235bcaa25e730394bddc66c74d6afdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594C 5428 bytes
font_01_sfnt_off00006bc4.bin
b6e041e48ae4bcf8301a66cdbd5a2fc005fd5d768c9eff1398bfb7ab9761c750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 9988 bytes

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