Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a732f5caef2fbc…

MALICIOUS

PDF

46.5 KB Created: 2020-07-23 17:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7316aa4f10abc723cfaf1a43cf3ca165 SHA-1: 20077e8ef73a670dce6505b6afb9cea617de9a02 SHA-256: c8a732f5caef2fbc83334c7969a7b9fa362408ac7042e75c1470f0ece2d280a4
128 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as an exam form, indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'SE_DOWNLOAD_BUTTON' heuristics. The primary malicious IOC is the ttraff.ru URL, which likely leads to further compromise. The document body is heavily obfuscated, but the presence of the exam form lure and the malicious link strongly suggests a phishing or social engineering attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=afcat+exam+form+2020
    • http://files.innervoiceintuitive.com/uploads/1/3/0/9/130969054/pagovewusep.pdf
    • http://files.xcivcouture.shop/uploads/1/3/2/6/132695697/7067138.pdf
    • http://files.mymanelegacy.com/uploads/1/3/1/4/131413718/numoji.pdf
    • http://files.anneboring.com/uploads/1/3/0/7/130738564/9608893.pdf
    • http://files.wrightthewriter.com/uploads/1/3/0/8/130873914/8682075.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/5178827761.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/bigovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/19703612726.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/21366590468.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/nupizulinimofujuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/jolosagunap.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/13115124326.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/vunozepizivepof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/32886294855.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/
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/21

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007858.bin
20e6cf8d1c6c0c262b99eecb60169c9670a5a0bd154aa2f6e28ab270358506d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 4784 bytes
font_01_sfnt_off0000888f.bin
fb90766a45a5099f53ef19780a32ad267ceb4555d446a66fbfde40c0740d5474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888F 10804 bytes

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