Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17bce7f5e89fb3a…

MALICIOUS

PDF

41.4 KB Created: 2020-07-09 02:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba451bb3c073353a295edfc9ba1b1e9f SHA-1: e1aa2330242c670b9762ab90e960bd522b413570 SHA-256: d17bce7f5e89fb3aacf809b030786761e3f5bde8062cfde098bc66356b01a74b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to seemingly unrelated PDF files hosted on various domains. One prominent link, disguised as 'free printable math worksheets', redirects to a malicious URL. This suggests a SEO poisoning or link farm attack designed to drive traffic to malicious infrastructure.

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.cc/wb?keyword=free%20printable%20math%20worksheets%20for%202nd%20grade%20subtraction
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.educationalresourcesummit.com/uploads/1/3/1/8/131856770/63145.pdf
    • http://files.bromswoldbikefest.org/uploads/1/3/1/3/131381722/xefit.pdf
    • http://files.familylawyerminnesota.com/uploads/1/3/1/6/131607712/jubigi_vomikewupinoz.pdf
    • http://files.emeraldpreschoolandkindergarten.com/uploads/1/3/0/8/130874544/9350766.pdf
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • https://worokuwot.files.wordpress.com/2020/07/rizabufi.pdf
    • https://talafup.files.wordpress.com/2020/07/radezudutudufijisemu.pdf
    • https://xivuwor.files.wordpress.com/2020/06/864427432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.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_off0000611d.bin
86960b4a69414a48c758b8c09ceee2e02c068f70645f126104552dbda0f5827b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611D 5836 bytes
font_01_sfnt_off000074d3.bin
3dce214b2d1a702ad25d37aff3c58be7f02d3c7992ccfceb7ffd332c073536c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 10340 bytes

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