Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b444f2a191aa4…

MALICIOUS

PDF

46.2 KB Created: 2020-08-25 17:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffe4f5efd67444e031ece2c6e819ba41 SHA-1: 8fee99d0bc46e8cb83b9ad4db8d252c6c2c7672c SHA-256: bc0b444f2a191aa44069bd2749a25f89f8f9f9fad0d688f2755e182ed1b78f65
128 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, presented as a lure for a 'Coreldraw format converter online'. This suggests a phishing attempt to redirect users to malicious infrastructure. The presence of numerous other links, many hosted on Shopify, indicates a link farm SEO strategy to improve search engine visibility for the malicious lure.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=coreldraw+format+converter+online
    • http://basar.dectfl.org/uploads/1/3/1/4/131437987/9267262.pdf
    • http://files.mariettadeckandfence.com/uploads/1/3/0/8/130814611/9422845.pdf
    • https://cdn.shopify.com/s/files/1/0433/4695/2351/files/taxix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/38900094833.pdf
    • https://cdn.shopify.com/s/files/1/0440/4730/2806/files/nedatogazipaporom.pdf
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/jijadagek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/assessing_student_learning_outcomes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/marriage_license_application_nyc.pdf
    • https://cdn.shopify.com/s/files/1/0432/0424/7716/files/bipedal_noun_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6806/files/3642152766.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/you_know_what_s_bullshit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee5.bin
45641d7d64f97d037d50d8977a9b4caf3cc6bb5436e2c9911dc2092143e13381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE5 5048 bytes
font_01_sfnt_off00007011.bin
afe4694cdb977ecb341c57bca43a36f44dcab4afea196555ea092d6730e4a85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 13096 bytes
font_02_sfnt_off0000971e.bin
3088de61ba4d2b01ab234d84e40a42107c4d30a52b1b9bdaf8961d49da71d313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971E 16076 bytes

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