Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09cf2bc108ac10c…

MALICIOUS

PDF

31.3 KB Created: 2020-08-19 02:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8033d321fb4de913a94e493a975cb9c0 SHA-1: a33132bc1258a9528c9074b2167d14376c45d9d5 SHA-256: e09cf2bc108ac10c4b781ed9c7b1470c296d670f732cf2fb501627f00afe903e
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=chocolate+cake+photos. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a link farm or redirection attack.

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=chocolate+cake+photos
    • http://files.shinyobjectsvintage.com/uploads/1/3/1/6/131637553/38b1a0de.pdf
    • http://files.writerwadekelly.com/uploads/1/3/0/8/130874529/9574220.pdf
    • http://files.madelinekloepper.shop/uploads/1/3/0/7/130775866/bufagobopuxot_jusiwo_xidozoboxolifav_nunolafojuxuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9662/files/71466389781.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/mewogiladatimigigeporidaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/fuwagotudokimaloxefewajax.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5446/files/45620640742.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/tumilotepilakug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/pretty_ugly_poem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/bobulavomijasisewim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/34740876423.pdf
    • https://cdn.shopify.com/s/files/1/0432/7509/2132/files/32602039902.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_off0000403e.bin
b3982b085c33554cf1715e766567fd1b5e230119bd4e409d79fec404666f7072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x403E 4896 bytes
font_01_sfnt_off000050db.bin
f7da25003bfadb46298ee6ae4791b405dcccb20dfa0cddc8c453f5c85e557968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50DB 9404 bytes

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