Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a33fbdd130138e…

MALICIOUS

PDF

48.9 KB Created: 2020-07-30 16:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a77655c4b746a84e6f932f6bdce23c SHA-1: 4586fd105fea8e539e78dca462585242640f5756 SHA-256: 51a33fbdd130138e1f4a2e2eb3c899bcfbdd789f362e44a535c89c01df64aa7a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to shopify.com domains, likely for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains strings related to 'fighting malicious code pdf' and 'wkhtmltopdf', suggesting a technical pretext for the malicious links. The presence of numerous PDF links and a malicious redirector indicates a likely attempt to distribute malware or phish users.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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=fighting+malicious+code+pdf
    • http://files.mx.nrvprocessing.com/uploads/1/3/0/9/130969300/8368675.pdf
    • http://files.kindertimedaycare.com/uploads/1/3/0/7/130776487/f20f6c0c56f986.pdf
    • http://files.heidiho.org/uploads/1/3/1/1/131163867/1078a3b28237905.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/1643384701.pdf
    • https://cdn.shopify.com/s/files/1/0439/2606/1224/files/23775950081.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/tujugogisanoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/wulizo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/52601031656.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/zupexotavidowudasanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/xodamiwevoroposejivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/rovuxadusoja.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/nemajudivad.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/badixalolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/13085149244.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/gejotaxa.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_off00007f7d.bin
0a6d0470e9415a4b34443c29971a67d2049ca84abd7176e61b4872da410bbfd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 5308 bytes
font_01_sfnt_off00009161.bin
2275aad23f80c56cd9958d23098d70b4ae4e0ffc88e73bfd5d8e2e6032c3b10e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 10884 bytes