Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25594a9d226134f…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee60fa933195246940ce5e623235d6a SHA-1: 52fa53a0a200e89a8c3777631d47e3346836f580 SHA-256: a25594a9d226134fac8fce916731509e947559ba94c6aaf94a7d5981533e8b83
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=business+english+conversation+worksheets+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0433/6576/1176/files/vapixutofasusezofizelojaj.pdf'. The document body, though heavily obfuscated, contains fragments suggesting it is intended to appear as a business English worksheet, likely to trick users into clicking the malicious link.

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=business+english+conversation+worksheets+pdf
    • http://files.followthepathtoyourart.com/uploads/1/3/1/3/131383743/fce5a28f.pdf
    • http://files.rosemaryrichings.com/uploads/1/3/1/3/131398360/segegatufemobek_gokurir_wukevivadi.pdf
    • http://files.donnafiggdesign.com/uploads/1/3/2/6/132683135/d2102.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/vapixutofasusezofizelojaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7271/files/xitivutosed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/newom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/vewisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/apj_abdul_kalam_essay.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/99514797765.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/wusuragijazaxuxomimupovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5081520916.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/lukepazonuramot.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3303/files/xanobenijotatawal.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/1/0429/0415/837

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c1.bin
9cf4aaab52f5e2b2b5c5b518d6699e197c4d3c0b16a30e323eceddaed230908d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 5680 bytes
font_01_sfnt_off00007a31.bin
719045f4b817f7f4e20c217a36a2ee923ae18de2875a58b58b342712d570c758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 12956 bytes

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