Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf255c21a0648a5…

MALICIOUS

PDF

43.0 KB Created: 2020-08-28 10:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd89027fce3cb586820ee2f49a851ce SHA-1: 8b2f8d4aa7821518f517848e4cd3d1ba063b9e36 SHA-256: edf255c21a0648a58d4fbe9d9df4035853fc94ecd4c47fdfdcc29bb1802a0419
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/pify?keyword=ielts+academic+writing+task+1+useful+phrases', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links pointing to Shopify domains, likely as part of a link farm to improve search engine ranking for malicious content.

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.ru/pify?keyword=ielts+academic+writing+task+1+useful+phrases
    • http://files.themutedwalls.com/uploads/1/3/0/7/130776434/tipogibefax-jigitojeni-wusozu.pdf
    • http://files.makeoverbathrooms.com/uploads/1/3/2/3/132302894/a17f326c08895.pdf
    • http://misefiz.cambridgeintlschool.com/uploads/1/3/1/3/131383541/bced432f6.pdf
    • http://pugenaw.chainoflifemovie.com/uploads/1/3/0/9/130969742/gelezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/52725006989.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/atualizar_android_no_mxq_4k.pdf
    • https://cdn.shopify.com/s/files/1/0462/0415/8105/files/governing_states_and_localities._5th_edition._online.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/gofobulojeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/97144471729.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/butterfly_valve_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/formula_para_sacar_el_area_de_una_pi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/84676376128.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_off00006171.bin
cd8a356d03f3cb11882ca2314c22cb620293c3416ac2a44b30a3c1e4d75a6e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6171 5716 bytes
font_01_sfnt_off000074cd.bin
9b4b14c66819909844e796ea52cec8bd7db49c873709d6c18176fdd9b2848cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 15780 bytes

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