Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be086d987549da…

MALICIOUS

PDF

50.7 KB Created: 2020-09-11 08:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c874183c3d4de6fe90f6b98d75c6aa5 SHA-1: 305292449242f6353c285d869a3b49e396e1c335 SHA-256: 88be086d987549da16bb72931fe9b5b581ee3f8372dd313ae78d9c111e5cba7f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a deceptive title suggesting it is an academic document, but it embeds a malicious link. This link, 'https://ttraff.me/wix?keyword=analise+combinatoria+exercicios+resolvidos+com+calculos+pdf', is flagged as a malicious redirector. The file also contains a large number of links to other PDFs, many hosted on cdn.shopify.com, which is characteristic of SEO poisoning or link farm tactics. The primary intent appears to be to redirect the user to malicious infrastructure via the embedded link.

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.me/wix?keyword=analise+combinatoria+exercicios+resolvidos+com+calculos+pdf
    • http://kigutu.creativedentaldesignsaz.com/uploads/1/3/2/8/132814930/nufow-tovomu-gejusaza.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6be4d119454488385e544be8e0be150.pdf
    • https://static.usrfiles.com/ugd/564d2e_e716671dcf3f4b998e37c77a073db9a5.pdf
    • https://static.usrfiles.com/ugd/cb2bed_9da68fce12d7408c9224303de42b7304.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4214/files/vumarirozaxejelajut.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/rutherford_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0457/3734/5180/files/54537204474.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/genojexewemixibenok.pdf
    • https://cdn.shopify.com/s/files/1/0461/9114/9214/files/nottingham_university_samworth_academy_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/25097742742.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_off00007bdf.bin
965f6a9b2ea8b133dab5fa737314f25607f8bf35d7bb9182d4389f9af36e72b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDF 5560 bytes
font_01_sfnt_off00008eb3.bin
a7f42a530c3f1d77fb06cbe156ea9ff138953885bafdf70f5ca7867aab5ced78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB3 15360 bytes

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