Malicious PDF — malware analysis report

Static analysis result for SHA-256 0680f1623773bbcf…

MALICIOUS

PDF

47.8 KB Created: 2020-08-18 14:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b57f731d60057cad32392e57bfef607b SHA-1: 28594ad7230535f1736e854e372df00010b4fb8f SHA-256: 0680f1623773bbcff76014d3e91d5b834aa21011a651aa759da0734bbd15f65d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the same redirector URL and a large number of links pointing to external PDFs, suggesting a link farm designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=fraction+word+problems+adding+and+subtracting+worksheets
    • http://files.lovemybakes.co.uk/uploads/1/3/1/1/131164568/xatipevoxis.pdf
    • http://sitom.fredtoke.org/uploads/1/3/0/8/130814328/387776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/69410293089.pdf
    • https://cdn.shopify.com/s/files/1/0438/1877/8781/files/64308411149.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/jiteredupazopabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/28833682530.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/boats_and_streams_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/55961517995.pdf
    • https://cdn.shopify.com/s/files/1/0440/8632/9509/files/doena_addison.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/38657426932.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/canara_bank_statement_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/maritime_accident_report_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/28762039023.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ef.bin
f08d51f8a2af3b4604c62d557afba3e12b78039cfbe08d6d47619b536c541da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EF 5736 bytes
font_01_sfnt_off00007451.bin
f0377f080d8481d4bc44834d552c42b69d98d0cb2687fc1815c0c81fa53f8e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 10732 bytes
font_02_sfnt_off000098e4.bin
d019f8d4202577ca4947e2f2f07f88bc135644a1d902f2df624ba9b3966fc06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E4 17412 bytes

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