Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aee97c2d6c1993b…

MALICIOUS

PDF

47.5 KB Created: 2020-07-28 23:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7375736bfc336f7a4f67b7fdd739f80 SHA-1: eea74b3f5292a046cd4ead2903f45f9d996b0302 SHA-256: 4aee97c2d6c1993bd37505a6ff9fc1aa7b6cab282cab91250cbbb2745d294550
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is associated with the lure 'bloons tower defense 5 apk and obb'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to the lure. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.com/pify?keyword=bloons+tower+defense+5+apk+and+obb
    • http://files.connorsenterprises.com/uploads/1/3/0/7/130775853/wexunolonafojexafi.pdf
    • http://files.blackdogdigital.com/uploads/1/3/1/4/131406321/mafepikutidiv.pdf
    • http://files.bradburyhairmakeup.com/uploads/1/3/1/4/131453989/wivibizimusepig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/44720442775.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/62709588638.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/juwegire.pdf
    • https://cdn.shopify.com/s/files/1/0434/5525/0598/files/33251061542.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53681635306.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/voxame.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/ditunofivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/49908585270.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/bosararutagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/noboxotenugusevafudovaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/nosafopagaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/89931040655.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/1/0433/0687/7080/files/536816

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b00.bin
8b73929a0177ed581e9b4455aa188f57128e1163d6a68403f4c826d18bbb7590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B00 5244 bytes
font_01_sfnt_off00008cf6.bin
cc233f0d8836799e15d87c44249c9690a532f3cc31ffdaca81ce0dc955bc1d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF6 10436 bytes

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