Malicious PDF — malware analysis report

Static analysis result for SHA-256 36918c423204eb25…

MALICIOUS

PDF

42.2 KB Created: 2020-08-21 16:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d9a4a668905ee94acef6989aa1578c1 SHA-1: ff252f05ef01250a963517e673aff649a9a2d6f1 SHA-256: 36918c423204eb251d6b8a41f8a1d1e94761cd859ded001dea050db33301e0d9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The document body, though heavily garbled, contains text that appears to be a lure for 'Windows defender windows 8 64 bit'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site. The PDF also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm techniques.

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/pify?keyword=windows+defender++windows+8+64+bit
    • http://wejekivux.leftinspain.com/uploads/1/3/1/4/131407995/c260ecd8d429b.pdf
    • http://wofaf.maclachlanmeadows.com/uploads/1/3/1/6/131606003/c5ae1b056e2.pdf
    • http://files.yardsoffunwny.com/uploads/1/3/1/6/131607163/nupudijewikuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/sixeni.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/kupasutumuxumew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/zaruxorapilojajimatisexod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/basic_proportionality_theorem_proof.pdf
    • https://cdn.shopify.com/s/files/1/0430/8313/7178/files/linisake.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/tofob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/db_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/wuronagev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9572/8029/files/sukimamupiwavolukolosoge.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/mikogevuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/99298709982.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_off000065bf.bin
782bd73c9534e40abc810a76a567c7fa6844fb477bc767939f07a49a92d6ebaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BF 5340 bytes
font_01_sfnt_off0000781a.bin
9457cb8b53644037a79c623bf8a3d12be2c313046c482189d458448fca74f0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781A 10588 bytes

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