Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3994090a9c50bfe…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 12:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5608d200e37e94a829e3e74784951e65 SHA-1: 2fd6efdc8c9efdfabd34b37267f6a327215cef9f SHA-256: c3994090a9c50bfee168089184bc3c7e1b6f2ec75399fddb9fe6c5460011a4b5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious due to its inclusion of a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. One of the embedded URLs, https://ttraff.cc/pify?keyword=laboratory+safety+definition+pdf, is flagged as a known malicious redirector. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for the malicious links.

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.cc/pify?keyword=laboratory+safety+definition+pdf
    • http://zebasat.paradisecoastreport.com/uploads/1/3/0/8/130815017/2207271.pdf
    • http://files.summitlakewi.org/uploads/1/3/1/0/131071043/moputexokuwilosukaz.pdf
    • http://files.belizelionfish.org/uploads/1/3/2/6/132681359/toxapuzapak-firigaxodi-pisenavakewiv-wevomadipitesim.pdf
    • http://mumenu.ancastersmallfrypreschool.com/uploads/1/3/1/4/131438464/405ae.pdf
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/tirubimosepufowalebibise.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3899/files/56362033137.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/mewude.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/jojekalanebujesibili.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/nepetitewawamoweru.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/9417561349.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/medical_biochemistry_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/19891373928.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58580374151.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruxejuvekega.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9463/files/10938135801.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_off00007995.bin
f5cfddd7ecd0963706dcdd9a708b8aabaf9379517de2cfd95962a45c1b8d5770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 5188 bytes
font_01_sfnt_off00008b4c.bin
e6741398f0acca4a8b4f9ec8c0a6c1561146f50e34b84bd1d0f780295c9b62da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 9856 bytes

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