Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a097e6657e2e395…

MALICIOUS

PDF

43.6 KB Created: 2020-08-21 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2a685c7dc02f0518b6f7652f2c57b5a SHA-1: 6b22323d85daad2c58fe4f85c9fa674be6482822 SHA-256: 3a097e6657e2e3953a04522384daa7498a2bdd288644db8e53274214eeb0a369
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to redirect users to malicious infrastructure.

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.ru/pify?keyword=bootstrap+css+grid+template
    • http://files.allencblack.com/uploads/1/3/0/8/130874647/tifuvurafodosomajit.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/kudaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/64943892441.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/79897743014.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/mewigatopupiwowedaned.pdf
    • https://cdn.shopify.com/s/files/1/0429/6163/3439/files/zakejojuxefinufutoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/51165148173.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/peminesiropob.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/burutebelufof.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/91509884742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/kituxanode.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_off00005f3f.bin
cf53de97c7152b516fba570b597386df755c799b030abf50f6f7e176d5bfe3de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3F 5440 bytes
font_01_sfnt_off000071a5.bin
ae9372b91186664822b6331e27287d892d3a863cf8a30902f3fb627ac42564b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 14748 bytes

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