Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3fd93cab4d935…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 17:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 705370939968b99dce5a95d48a159285 SHA-1: 7f3454ec442d788d3aa5b6b0072ac963d96f00c3 SHA-256: 23f3fd93cab4d935bebd56ef3f25c6de5b5df3a1e247b050261d158c90b31dce
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, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the links leads to malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic suggests a tactic to artificially inflate search engine rankings or distribute malicious content through a large number of links. The document body contains garbled text but includes the URL 'https://ttraff.ru/pify?keyword=proyecto+alumbrado+publico+led+pdf', which is flagged as malicious.

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=proyecto+alumbrado+publico+led+pdf
    • http://files.keeliesheridan.com/uploads/1/3/0/9/130969183/2743656.pdf
    • http://files.onmrrc.org/uploads/1/3/0/7/130776041/relemifadosijuwadabe.pdf
    • http://wukutewaw.rivieranayarit.ca/uploads/1/3/2/3/132303189/tewiviripetubasu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3804/6365/files/chlorhexidine_gluconate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/zosofotafujube.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/saxunabejid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/fodivenagofaputepiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/zemebatilazirekevofafukik.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/51592929524.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/56751651983.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/90953398049.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/99572855205.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/zelagekubipuwujugeremoki.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_off00005e00.bin
e84a94193267993fa2d4420382f748af638934545d9f103a1f328a776e44d670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E00 5368 bytes
font_01_sfnt_off0000702f.bin
2f439a1bbbfee7076c965d5305aa21673655a6ce38e8d758147e6211a4fb96d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702F 11496 bytes

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