Malicious PDF — malware analysis report

Static analysis result for SHA-256 2623882465cac324…

MALICIOUS

PDF

38.4 KB Created: 2020-08-04 01:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9baa046e6ab57a4f8a2a3ee73fb3efac SHA-1: d70fb68cd3305b8245e887d6d2b94ba316890e70 SHA-256: 2623882465cac3248b5122b04d3e8602d539f3213ea1d040595f47d19307ce9e
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to obscure malicious activity. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to funnel users to potentially harmful content. The document body, though heavily obfuscated, also contains this URL, suggesting an intent to lure users to external sites under the guise of providing educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=basic+electronics+nptel+pdf
    • http://files.mbabechuk.com/uploads/1/3/1/0/131070457/1400e0b628b2.pdf
    • http://files.majestictheatre-lee.com/uploads/1/3/1/4/131406807/vekotuwusuma-duzilesizuso-kikuvejokupigu-korosigidiz.pdf
    • http://files.rcbaseballcards.com/uploads/1/3/1/1/131164159/zepuxukolasak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/carol_of_the_bells_leontovich.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/60210062334.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/kuxixubibobipofebivo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/air_conditioning_and_refrigeration_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0432/6398/3769/files/21463925429.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/tesiwipedifepemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/66420237661.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_off00004bc0.bin
fc4568bf1028e8203afeb416a4a145d6c039c5ed48b5c4b80dc5bbcb3dff38b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC0 5200 bytes
font_01_sfnt_off00005d7e.bin
db680f21ecae93197dfe5fddacce096e2bfb6d7ab4ae08b125656ec707f3ae18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7E 14592 bytes

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