Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbcefc92ad11045…

MALICIOUS

PDF

39.8 KB Created: 2020-09-17 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028ba0a2c4385dd3866f10622376e62d SHA-1: bc18d741b39bac54a2299de13c5469f5b8903724 SHA-256: cdbcefc92ad11045a605e643f4b41cdbdde3b8ea8e27cfc9668b4fe247c29f88
150 Risk Score

Malware Insights

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

The PDF contains a prominent link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting it is a 'vocabulary workshop answer key' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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.club/wix?keyword=vocabulary+workshop+level+b+unit+1+answers
    • http://files.outdoorsmanwoodproducts.com/uploads/1/3/1/4/131408854/9988179.pdf
    • http://files.seasholes.com/uploads/1/3/2/6/132680813/4691402.pdf
    • http://pegiku.yesternoir.org/uploads/1/3/0/8/130873843/dunuwotigemilutik.pdf
    • http://files.maryjanemitchelldesigns.com/uploads/1/3/1/6/131608016/6106109.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5690/files/libupugemefizejoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/back_at_one_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/hungarian_method_solving_assignment_problem.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/71444998395.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/12718751392.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/widagerusataw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/36367200828.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_off00005f5d.bin
d58891dae8eeeb71562728238b0c12c86bc21186e5fdf744d25d23244eb32005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 5496 bytes
font_01_sfnt_off0000722a.bin
8ee960075225bccd6a4270fe50f911412a5f1ec6c8cd307b5d5e6699d339070b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722A 9596 bytes

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