Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9c0237241dcf27…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 07:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8742279e50180fbe811652d3ba059290 SHA-1: b0ee94e8d9d557ead618c73a6467ec897160676b SHA-256: 5c9c0237241dcf27be79de69e0074a81fb496a736bc301c93318483ccec6b57e
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though partially garbled, contains text related to a 'Nokia android one phone review' and a URL that appears to be part of a link farm designed to distribute malicious PDFs. The presence of embedded links and the heuristic firing for 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggest a phishing or malware distribution attempt.

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=nokia+android+one+phone+review
    • http://files.getstitchedsewingstudio.com/uploads/1/3/2/6/132695663/losilivevune.pdf
    • http://regamivid.vhcministry.org/uploads/1/3/2/6/132680813/c2803eb87.pdf
    • http://files.frhsmusical.com/uploads/1/3/2/6/132695416/240020.pdf
    • http://files.makercrew.com/uploads/1/3/1/3/131379699/7090714.pdf
    • http://files.lindagrahamdesign.com/uploads/1/3/1/6/131637374/9219875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/1007/6321/files/direct_sequence_spread_spectrum.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/control_total_de_calidad_feigenbaum_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/suvefarofovazik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/japudonokobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9521/8594/files/belles_phrases_d_amour.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/chrome_browser_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/natala.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/corona_render_c4d.pdf
    • https://cdn.shopify.com/s/files/1/0437/9633/2705/files/livro_abandono_afetivo_indenizao_por_dano_moral.pdf
    • https://cdn.shopify.com/s/files/1/0462/2453/9802/files/airtel_bill_in_excel.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_off000062e6.bin
d05b6654ec45af01e1c042bcb1016de6c8a24f0f3c3bb4a4eb588f18369f1177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 5024 bytes
font_01_sfnt_off00007408.bin
46f2a8d052a85c4b4e4d59ec1939166f20957b87c83eeb23c956e086c34d179b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 10300 bytes

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