Malicious PDF — malware analysis report

Static analysis result for SHA-256 83565e563b2b6bbb…

MALICIOUS

PDF

44.0 KB Created: 2020-07-27 15:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccecb4d5dff7151bfabd57578ad11e45 SHA-1: aa9563a849c6cb356fc0a78f0d9992c0cf471f00 SHA-256: 83565e563b2b6bbbb64305532040d470c930bc413d590053f5592a9227dfd82b
168 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector and part of a link farm, specifically using a fake invoice/payment lure. The primary malicious URL identified is ttraff.com, which is likely used to redirect the user to a further malicious destination. The document body, though heavily obfuscated, contains text related to 'Explanation letter answer' and authoring metadata suggesting it was generated by wkhtmltopdf, a common tool for creating PDFs from web content.

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=explanation+letter+answer
    • http://files.sacredrelationshipretreats.com/uploads/1/3/1/8/131872087/kigebunivebuvapabif.pdf
    • http://files.katialubchenko.com/uploads/1/3/1/6/131606674/4148436.pdf
    • http://files.vacationsbycarla.com/uploads/1/3/0/9/130969305/teliburetubaba.pdf
    • http://files.jenniferalvaro.com/uploads/1/3/1/4/131454523/wuridemekaparu_nagejawubesodu.pdf
    • http://files.minibaraddict.com/uploads/1/3/1/3/131380308/midelid.pdf
    • http://files.sacredrelationship
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8567/files/bazunigufemavejeradumefop.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/93265026759.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/rivebipadukugodapanafij.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/8255964920.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/85351818071.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/wijazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/temufasopenaxixabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7838/files/vanazomifusarabev.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/xalijoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/23408131990.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/92985448415.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_off00007021.bin
8da2a5787ab321069609b4f505daccd0d9930f6c50ad205e2b30e712364b7056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 4716 bytes
font_01_sfnt_off00008039.bin
7c9b8db4e4b954dffe5b81a235f04fc4fd204b9d83a2f73a84864eb2e75d20e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8039 10144 bytes

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