Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a88484bc82338ea…

MALICIOUS

PDF

43.0 KB Created: 2020-07-27 21:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 422a59ecb7a93cb324b33200dd16c70a SHA-1: c72d3c2282d9a8fdb5c9b75f6d33e4207ecae68c SHA-256: 6a88484bc82338ea7def4335472ccdf196de8b3107f388c41a9880f0cc49ebde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=6th+grade+math+skills+review+worksheets', points to known malicious redirector infrastructure. The file's structure and the presence of numerous external links suggest an attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

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=6th+grade+math+skills+review+worksheets
    • http://files.livingstonphotos.com/uploads/1/3/1/4/131452982/2811942.pdf
    • http://files.conejoroyals.com/uploads/1/3/1/4/131407135/domisemune.pdf
    • http://files.boydfilm.com/uploads/1/3/0/7/130739333/xuxipofuxogal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/47255640764.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/ruweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59044096386.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/mikutovitotevawozaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/nedodizesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/fexamamuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/36371964259.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/25297849083.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1873/files/94821855271.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/xafowogik.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_off00006b62.bin
2c20129ee33d45392ffe78a92ae61ce9270aee8fca2ba69f55cdbb9915e8d628
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B62 5196 bytes
font_01_sfnt_off00007d19.bin
7c686c6890694cd7e71990fec0e3b97b22aea229d5c3d43677180130c5c03cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D19 9948 bytes