Malicious PDF — malware analysis report

Static analysis result for SHA-256 65abcb5f8647b126…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 21:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0585d692ba3af55d7e386ec710ef3277 SHA-1: 5c9beb15f009c603a7a1c778eca827a9e0911e57 SHA-256: 65abcb5f8647b1264b725714706b512bc9355951e1d6e239ecf3facdcca800b1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised as educational worksheets. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection scheme.

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=analyzing+poetry+middle+school+worksheets
    • http://doxunu.julialye.com/uploads/1/3/2/6/132683209/retetefobiruf.pdf
    • http://files.1031publishinglane.com/uploads/1/3/1/3/131383386/bukojum-tevebugupi.pdf
    • http://files.photowraptextures.com/uploads/1/3/1/6/131606284/7cc155476419d.pdf
    • http://files.bvtrackandfield.com/uploads/1/3/2/7/132740352/kipibulaliwode-zefaxotorogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/vizufivogorapadizere.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/vuzewukivenena.pdf
    • https://cdn.shopify.com/s/files/1/0435/4578/8584/files/furasovojuva.pdf
    • https://cdn.shopify.com/s/files/1/0447/0561/1930/files/letter_f_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/tobififakilokidulidog.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/cahier_vacances_ce2_cm1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/accounting_for_management_decisions.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9462/files/offshore_fishing_report_cape_canaveral.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/kisawo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/the_possession_2012.pdf
    • https://cdn.shopify.com/s/files/1/0462/5507/9573/files/define_affine_transformations.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_off00006b56.bin
47c2c4328fd90d60381bdbe54e126ba60d762b28ba2bc023bf3461a0f0e87a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 5784 bytes
font_01_sfnt_off00007efb.bin
2f2a7ecb04d1c5f9d7d4ce81d7f8bac6e9043b5540b40052dd73322d6c2c34f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFB 10220 bytes

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