Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55dc07160090b3a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-11 07:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 611254519a44d2bfbcfb707e7aad47fb SHA-1: 2e425089f4891d6e67e05889b3ac703085162d73 SHA-256: b55dc07160090b3ad9dfcc16d45283483aa728aa4ad0045e814daa7afbf06b84
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, https://ttraff.ru/wb?keyword=knust%20courses%20and%20cut%20off%20points%20pdf, is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external malicious content. No scripts were extracted, and the PDF structure itself is not inherently malicious beyond the embedded links.

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=knust%20courses%20and%20cut%20off%20points%20pdf
    • http://lanur.ayitistik.com/uploads/1/3/1/8/131856190/ce8f06e2ee2adb.pdf
    • http://files.thestampprofessor.com/uploads/1/3/1/3/131378852/c23cc1bf2.pdf
    • http://files.pathwaysretreat.org/uploads/1/3/1/6/131637218/3661804.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/24392522260.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/allan_holdsworth_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/interviewer_preparation_before_interview.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/1667678778.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/biochemistry_practical_book_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7855/files/lotexiwusomazunimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/autocad_to_converter_free_download_full_version_with_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/33993068001.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/arbitration_and_conciliation_act_1996_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4871/files/55111818065.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_off0000605f.bin
79ad462a8d16039e0febb86fbd7a00b3573bb0eecabf5b0790bf62b5a6a25322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 5084 bytes
font_01_sfnt_off000071b9.bin
4024057fca6a6cbee13289db37e075186adec290f4da70db744c166662481506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B9 14028 bytes

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