Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd53bd73f94605cb…

MALICIOUS

PDF

47.4 KB Created: 2020-08-22 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70a2939087444ed753fc57ec6865f65a SHA-1: a647c0a3228f60cde4fe22aa5ac7c1db99cc32dc SHA-256: bd53bd73f94605cb1523794c0e96bd6595896353814f7d24990a22faf6f3a575
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One URL, 'https://ttraff.ru/pify?keyword=adaptive+cluster+sampling+pdf', is flagged as a malicious redirector. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for links. The primary attack pattern appears to be SEO manipulation or distributing malicious content through a large number of external 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/pify?keyword=adaptive+cluster+sampling+pdf
    • http://files.citiesbysara.com/uploads/1/3/1/0/131069875/begaselapatilur.pdf
    • http://dibux.theconcertspot.com/uploads/1/3/2/7/132740494/virilidowawivajozo.pdf
    • http://files.aaronstarnes.com/uploads/1/3/1/3/131398244/gevidisurixon-zokogerotifike-filigufarisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/4733116727.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/nasobixupebekedewolibesej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/5693420351.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/irritable_bowel_syndrome_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/7177229807.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9133/files/vijeleb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/8224160890.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9335/files/62009527231.pdf
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/zuwakozabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/644048978.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_off00007bca.bin
0dab6959b6cb10b1d63730045f249b6f02c40028a085e39891b46fdacf12c603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCA 5524 bytes
font_01_sfnt_off00008e81.bin
dd5557cefb5d9d234d6d53d78aecb029dc6c715d6c628a613eecf90da4da6456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E81 10068 bytes

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