Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20575787bd24c2c…

MALICIOUS

PDF

44.1 KB Created: 2020-08-13 23:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43848d8ffa80b3a78742e857643e1ae4 SHA-1: d9f06d6a442c52cad50fcd270cb13704c183b77d SHA-256: c20575787bd24c2c83b7043d3de45b0ebe0f13ed5d80ddee0e1fafb39051fa3f
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One such link, 'https://ttraff.ru/pify?keyword=math+worksheets+for+grade+3+regrouping', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to this malicious domain. The file's structure and the presence of multiple external links point towards a link farm or redirection attack.

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.ru/pify?keyword=math+worksheets+for+grade+3+regrouping
    • http://kowetu.wineslothclothing.com/uploads/1/3/1/4/131407435/zenokepixenijum-tonezudalu-dupizujezewoxe-zuguxawetil.pdf
    • http://files.mexiitem.com/uploads/1/3/1/6/131606526/8642623.pdf
    • http://gifol.fushionbeauty.studio/uploads/1/3/1/3/131383770/sivuwunenib.pdf
    • http://files.dankcityclothing.com/uploads/1/3/1/4/131452991/b0d17ec.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/example_of_internship_letter.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/lusapepapipuzat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/numilemevogemuliwopin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/galibep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/brunnstrom_stages_of_recovery_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/22646854484.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/calendario_2020_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/smash_mouth_discography.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/tarewigexuzofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1146/files/zowulelerixeniwexinolik.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/gipubatunurepezuberez.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_off00006be7.bin
79258cec518014aeaa03019fb8d3af0a6b386354826a56eeebd77d62981d3b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE7 5596 bytes
font_01_sfnt_off00007f11.bin
14a5d91398327ade7eb108cfefde3d45af754f4d93464e6a48bffde560abaeae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 10588 bytes