Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b62b57c6d83b10e…

MALICIOUS

PDF

44.7 KB Created: 2020-07-30 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9502115fe29adaeb0dec8a4ae131bffa SHA-1: f23155f084eac31a917e428770c448743366b034 SHA-256: 3b62b57c6d83b10e2054c2494bf6e43b2a0f8b7992c1fea15deda5e75f492420
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'anatomy and physiology of human urinary system pdf', suggesting a lure to attract users searching for specific content. The primary malicious IOC is the redirector URL.

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=anatomy+and+physiology+of+human+urinary+system+pdf
    • http://files.ncstoragebarns.com/uploads/1/3/0/7/130739802/pudep.pdf
    • http://files.stuffyourfaith.com/uploads/1/3/0/7/130739362/6057853.pdf
    • http://files.neeshazollinger.com/uploads/1/3/2/6/132681826/rapemaderik.pdf
    • http://files.stuf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/24876667330.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/7426555230.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/vafofatofeziviruwon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/degidakolarakowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/78434511447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/70133549832.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/nizodesumukofa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/67709636391.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/wubemomuraredalowup.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6117/files/63612139520.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_off000070c9.bin
73159f5003c1830fe3267a790fc3e53cb9418cf57bd0fd6ab27d1e58ca8f017d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C9 5428 bytes
font_01_sfnt_off00008313.bin
359d8008a35309bac95ba1db4112f957f46d58838ea7e04987c3f27c9450b287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 9896 bytes

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