Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b71af3bb0e6497…

MALICIOUS

PDF

38.2 KB Created: 2020-08-18 22:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2c8b0805f287440a994a22e3314668 SHA-1: d1621720efcf381399d622c815a3fa4d3a1e950f SHA-256: 23b71af3bb0e6497ef82b00a9c54b4fa816905fbeeb8cc0853f33084090607cf
128 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'self certification fit note form' and embeds numerous external links. One critical heuristic indicates a malicious redirector link pointing to 'ttraff.ru', which is likely used to funnel victims to further malicious content. Another heuristic flags a PDF link farm hosted on Shopify, suggesting a broad distribution effort. The document body, though partially corrupted, contains the malicious URL and references to the form, reinforcing the social engineering aspect.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=self+certification+fit+note+form
    • http://files.theeyelashindustry.com/uploads/1/3/0/8/130874642/tixuzuw_botituwurepuxil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0436/4982/6969/files/memevojekokiwokitopabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/66744553239.pdf
    • https://cdn.shopify.com/s/files/1/0451/4299/9194/files/aggregate_demand_and_supply_curve.pdf
    • https://cdn.shopify.com/s/files/1/0461/9629/3790/files/92070148179.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/17418995005.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/business_process_management_concepts_languages_architectures_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/1844/5223/files/99925323779.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/kuwodudomevegega.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6509/files/pusozowekorelawatila.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/79547795896.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_off00005932.bin
b6a9684c241e279ec45b50e5e8d240b6d62f370b80c356612e7ce726cc790ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 4952 bytes
font_01_sfnt_off000069ec.bin
3fdd6548fb30de1af24afea8cc81041c741439b67ab4b4cc10236382106f2b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 10076 bytes

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