Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eef8124e39079b6…

MALICIOUS

PDF

47.0 KB Created: 2020-07-23 04:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6643e2051413bac4c56eee70c35bf2e SHA-1: b2ae0434ae2a13b9b9f1ddef39ef3c33a12b61d4 SHA-256: 8eef8124e39079b64dc43dd7a9855587a0e897bebc9fcc9c40d56f1eb265e085
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links, including one to a malicious redirector, suggests a phishing or redirection attempt. The file was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links.

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/wb?keyword=minor%20agreement%20pdf
    • http://files.longbeachjunkremoval.org/uploads/1/3/1/6/131606072/rowokalidip.pdf
    • http://files.azkillerbeessoftball.com/uploads/1/3/0/8/130874518/jemizip.pdf
    • http://files.themelroesplace.com/uploads/1/3/2/8/132814473/xovoraj_zifirod_kizite_mopaluvu.pdf
    • http://files.alaskaascd.net/uploads/1/3/0/7/130775867/fanigilizev.pdf
    • http://files.bbfcafe.shop/uploads/1/3/2/7/132740270/1151702.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/12609313143.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/gejabelabikibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/35938596758.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/24138302482.pdf
    • https://kebufif.files.wordpress.com/2020/07/menavurarenidop.pdf
    • https://kubuvepex.files.wordpress.com/2020/06/kulobedufevukajided.pdf
    • https://bewolebo714032914.files.wordpress.com/2020/07/dezedanu.pdf
    • https://bekakum.files.wordpress.com/2020/06/wiwuxaporobenofin.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/nivamekipasoseku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8884/6753/files/84536879521.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/72064031558.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/4872835722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/2226421826.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/2747784762.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_off00007bf5.bin
a84b32cd2cbb2b3ff688af5bb475ebf60bd3cf87fcf5c147883cf4e6f9c0036b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 4944 bytes
font_01_sfnt_off00008cad.bin
ca5e782cff1e11036252b44b4bf13b405ecddf651805b7309505e95169c95ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAD 9988 bytes