Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f605e6bf8089e14…

MALICIOUS

PDF

41.7 KB Created: 2020-08-16 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c032a339b970b9d04e448f33dc32a61d SHA-1: c8c3e7fa4dada529dd3825a0c7d49e75c40a71d7 SHA-256: 7f605e6bf8089e144481845607ce70f019bb53ffd7077fe5f91e19fe6222d9b0
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.com/pify?keyword=calendar+october+2019+excel+template', is designed to lure users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, some of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=calendar+october+2019+excel+template
    • http://nudub.upstudiobklyn.com/uploads/1/3/1/8/131871991/xilizus-tadotage.pdf
    • http://files.honkrenaissance.net/uploads/1/3/0/8/130814078/kesosirosewifasoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0298/files/waiting_for_the_barbarians_coetzee.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/23543333952.pdf
    • https://cdn.shopify.com/s/files/1/0434/9807/8372/files/kifekewodixizeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/avast_free_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/42469643933.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/a_concise_introduction_to_pure_mathematics_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0453/6195/4971/files/29613441058.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/rc_jet_plane_design.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_off00006347.bin
90d374f102eb6b36042d27543601383802d43065831f8f74560b5581bb840dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 5636 bytes
font_01_sfnt_off0000765d.bin
af872af1dcf2564bffb9b8d677ed3e2ee63b3c4f5e66bec2e4a267e053f5b738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765D 10428 bytes

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