Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf2303fa099d929…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 22:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b9967a9b228197baeab7cd761f5e9b SHA-1: 31e491822b7b6971f9885a20f49c4a992baf1f80 SHA-256: 1cf2303fa099d92944fbe96a3f4e164aefe8eefb420d4873f877e8c4e55d422a
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, embedding numerous external links. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=metodo+de+analisis+y+sintesis'. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a programmatic construct. The presence of many embedded links, including a large number of PDF links, points towards an attempt to manipulate search engine results or distribute further malicious content.

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.com/wix?keyword=metodo+de+analisis+y+sintesis
    • https://static.usrfiles.com/ugd/5cf23b_e0b0d9e2405941808c544ed392ab122b.pdf
    • https://static.usrfiles.com/ugd/c1de29_e1c141415ad34d22b6f99a4647adc064.pdf
    • https://static.usrfiles.com/ugd/77941b_afdfe62e25074f75a7cf0b6a3ece9036.pdf
    • https://cdn.shopify.com/s/files/1/0437/6723/4714/files/vector_transformation_from_cartesian_to_spherical_coordinates.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/i_want_to_reduce_file_size_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/negaluzutuzajoxefotu.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/g_1_residential_building_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/movetuniloparereg.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/b8c837_be0ec9187d7547169cc924ad384d5531.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/random_discord_servers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6013/files/anhaltende_somatoforme_schmerzstrung_symptome.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/algorithm_flowchart_symbols.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_off00006bef.bin
544b5cddcb697624adc5b563108ebab0e5b29516f65819f883a1052c60bf6d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 4828 bytes
font_01_sfnt_off00007c7b.bin
bc85858b3153b812f68851d1583c6bb0cc99aafcc8d69d406c7214eea2509b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7B 11500 bytes

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