Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b71f004a078c4ea…

MALICIOUS

PDF

42.9 KB Created: 2020-07-27 21:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ac3b8e701571f0b4f5b0a80d6e1f156 SHA-1: 28f351cbdfdef8cf738a07bc05039585ccf04c04 SHA-256: 9b71f004a078c4eabbb9f600a0169bf83a79792ef8fcb72d151b172ee8aa374d
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary one being 'cdn.shopify.com/s/files/1/0429/1434/9219/files/nivuxigo.pdf'. The document body, though heavily obfuscated, suggests a lure related to 'converting fractions to decimals worksheet answer key', intended to trick the user into clicking the malicious link.

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=converting+fractions+to+decimals+worksheet+answer+key
    • http://files.ellen-rose.co.uk/uploads/1/3/1/3/131381363/moxonepekizason_tobirirof_vubino_kiwuvikuw.pdf
    • http://files.seasidejewellery.com/uploads/1/3/2/7/132712315/7998453.pdf
    • http://files.matthewmixes.com/uploads/1/3/1/4/131437956/sivoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/nivuxigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/51913698046.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/8338809742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/84078547466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9111/6700/files/kimiwupirisanex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/18694154560.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3791/files/kexuditofonomagivamefip.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/63129964485.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/kutoxixavemiluvu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/gonagovupejegajorujozi.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/1/0428/98

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683e.bin
a5bdf082643d27f7b66bdcb7aeb1527280b221d4f321d7b03fcc2852001e3999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683E 5564 bytes
font_01_sfnt_off00007b1c.bin
938b350f564ddb2087183ee9934fcfde8b52954a0200d7cc444448d12c70eb5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1C 10212 bytes

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