Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b922496347fa3b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-28 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05fc9d45773e1d0a8784613f20f94d13 SHA-1: a91d5c2c2dbd804b02954d059c5127d7eb7f3c64 SHA-256: c3b922496347fa3b3ed2843acecb4100d270b491b3f3974c753334043eb76740
150 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content.

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.club/pify?keyword=chopsticks+piano+easy+sheet
    • http://files.ilonayoga.com/uploads/1/3/0/7/130776131/befapituwado.pdf
    • http://juwinaza.nctreasurechest.org/uploads/1/3/1/3/131398140/8929553.pdf
    • http://files.raglandwrites.com/uploads/1/3/1/3/131398143/9286165.pdf
    • http://files.jasonleary.com/uploads/1/3/2/6/132683188/kavuf.pdf
    • http://zuzigana.carolchallis.com/uploads/1/3/1/0/131070420/nalifezitawo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8660/8552/files/kidzee_franchise_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/barter_system_advantages_and_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/dark_side_of_charismatic_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/mupupavorufubinetezu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9482/files/77910116641.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/3589734804.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nelafujadodejofit.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/26414895325.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/22798470834.pdf
    • https://cdn.shopify.com/s/files/1/0434/4260/2140/files/82777110863.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_off00006193.bin
4e110f6f4f3625fc1c4d5cf4da879a316035e5f945c45013cf80b5d1dc8c9c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 4964 bytes
font_01_sfnt_off0000727d.bin
61b0ea83c2073b9a02ee63874458497b9ec7d0c6bbf782d4a0496eb5f6530705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727D 10384 bytes

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