Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c55d2a93e42a65b…

MALICIOUS

PDF

47.0 KB Created: 2020-08-11 06:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ddf2b7032acce87a9d67a54e28db49 SHA-1: 4cea4b61ba434b0845b329194d519073421bf328 SHA-256: 0c55d2a93e42a65b55f72f559964ece3072ace9f8b45bbccd95bc6bae245957b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=central+limit+theorem+exercises+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be directing users to malicious infrastructure under the guise of academic content.

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.ru/pify?keyword=central+limit+theorem+exercises+pdf
    • http://files.hotmesshighvibes.com/uploads/1/3/0/7/130775109/5b07c3f2e0.pdf
    • http://files.cafe643.com.au/uploads/1/3/0/7/130775023/8c110b9112b276b.pdf
    • http://files.farcryproductions.ie/uploads/1/3/0/7/130738939/xavotofidegob_pevajewubukejoj_zalosizamogu_pakubiwavine.pdf
    • http://sololib.bethpoultney.com/uploads/1/3/0/7/130739678/vikalimi.pdf
    • http://files.jamesazarzana.com/uploads/1/3/0/8/130814133/3df677c28d84e6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/sikakawadotisedegokexilum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/character_traits_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/pdf_biomagnetismo_cuantico.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/minecraft_tnt_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/bedorodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/43633957316.pdf
    • https://cdn.shopify.com/s/files/1/0450/0822/4414/files/memorex_cd_lable_maker.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/16933657589.pdf
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/54869185027.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/calculus_with_analytic_geometry_swokowski_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/sujarewukugepa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007737.bin
beae51462d1e9f566ae302ef07b1a082349e99e7885ba80946c9cead3197b4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7737 5368 bytes
font_01_sfnt_off00008948.bin
92d0332195f282cb79430544a38e5512c51ba225c46a342c3ec8b56ab1509f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 10932 bytes

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