Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d8c4e42f1e87f2…

MALICIOUS

PDF

57.1 KB Created: 2020-08-21 09:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f89c21738050d1d005379693f13f6a SHA-1: 05e9cf58cc7225c629132bf101ef3c0a22141f8c SHA-256: a6d8c4e42f1e87f2f95a562c900d83903053009e64782fee8e961963a66d3b38
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the string 'Paracetamol overdose australian guidelines' and the malicious URL, suggesting a lure to redirect users to potentially harmful content. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many pointing to benign Shopify PDFs, but likely serving as a distraction or part of a broader link farm strategy. The presence of a malicious redirector URL is the primary indicator of malicious intent.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=paracetamol+overdose+australian+guidelines
    • http://warelidid.3am.ency-education.com/uploads/1/3/0/7/130776760/nafitem_wufuwixi_vukefape_garoka.pdf
    • http://lararuj.shennashepard.com/uploads/1/3/1/4/131406436/871b0b75fd7173.pdf
    • http://files.caitlinanthony.com/uploads/1/3/0/7/130739616/9529416.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/telegraph_avenue_michael_chabon.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/africa_twin_dct_or_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/51819376032.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/92955175821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/88442372563.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/caries_detection_dyes_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/18952055042.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/ethical_leadership.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_off0000975c.bin
9e9d3059f7ade0105ca10f737464afa040bf1beb94c9b439009476ec6e251546
pdf-font-stream PDF embedded font (sfnt) at offset 0x975C 5320 bytes
font_01_sfnt_off0000a959.bin
5692855cd220246fd6b0d3d8b2d8418d37a7eb4a0dbd6c25d868f71db6df341c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA959 14680 bytes