Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b259a31a2a11ef…

MALICIOUS

PDF

42.8 KB Created: 2020-08-18 18:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29e1b8cfd1383b49bf823b67346efe3 SHA-1: 37d3fde44bda375ee6aa2cc58247bbb13ff5e02b SHA-256: c8b259a31a2a11efda65c63c670b2a708107104663a4797cac8cf593fc462cea
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to obscure malicious redirects. One of the embedded URLs, 'https://ttraff.com/pify?keyword=application+of+antisense+technology+pdf', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was largely unreadable binary data, limiting further analysis of the specific lure.

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.com/pify?keyword=application+of+antisense+technology+pdf
    • http://files.chimtechllc.com/uploads/1/3/1/3/131398573/4a2b332e4781737.pdf
    • http://zadeda.ostrichhole.org/uploads/1/3/2/6/132681488/lawoganipufuwafo.pdf
    • http://files.chasemichaelmusic.com/uploads/1/3/1/4/131406843/7a385771ba.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/cagliostro_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/wevudikejewomafovojumajof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87074842841.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/bezadafebivinonipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/49746706519.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/bonalegebuzuwivujiza.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/candidiasis_oral_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/ramogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/72129709553.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_off000069c8.bin
a04476034bf3636c75b7bd2347a8d8d74d4574fa242a5997e7f36f71428b0b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C8 5412 bytes
font_01_sfnt_off00007c32.bin
3986a280688d124bdbf0cf52048bce7b10ed2e1c138f785085ea13c8c63cff55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C32 10168 bytes

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