Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8610ede40275859…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 04:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67f9db31617103a532a8ecbfbd89bac3 SHA-1: c3d163e8d2a51b6987999ec1e3a89363bce5f3b4 SHA-256: b8610ede40275859eff4645e6012f593f3e8965a693dbcb5fec850c69c98039f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is a PDF link farm designed to host numerous external links. The primary malicious URL identified is https://ttraff.ru/wb?keyword=rhetorical%20question%20worksheet%20with%20answers, which likely serves as a gateway to further 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.ru/wb?keyword=rhetorical%20question%20worksheet%20with%20answers
    • http://files.slowfoodcaterers.com/uploads/1/3/1/4/131438013/1768033.pdf
    • http://files.classwithchris.com/uploads/1/3/1/0/131069789/kejoleputunajated.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/fidepopipadagibolefozipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/50335121089.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/kiloniwurorisukefipulada.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/44403335477.pdf
    • https://cdn.shopify.com/s/files/1/0432/7725/4814/files/jujozema.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/runetowowafonev.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/vazururadinarafakizeb.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_off00005a72.bin
b481e8535f52b61a152137dd481610702bd2f25adecd66056ffd63f1a83686bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A72 5176 bytes
font_01_sfnt_off00006c1f.bin
a23d894f867871ebc6d0232f44da5a6754628592d937f0da79e521108d455df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1F 10680 bytes

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