Malicious PDF — malware analysis report

Static analysis result for SHA-256 298b25902c85a01f…

MALICIOUS

PDF

40.9 KB Created: 2020-07-09 01:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa2c874c17be8da7135677014938c88b SHA-1: efc426e865021e0b8334f11ba71f4c6ba5ef29d4 SHA-256: 298b25902c85a01f9b2e118d1b8cc9663a7b6d357bd26dc7db5edd923a8484e0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm or redirection strategy. One prominent URL, https://ttraff.ru/wb?keyword=nothing%20is%20impossible%20chords%20key%20of%20e%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=nothing%20is%20impossible%20chords%20key%20of%20e%20pdf
    • http://files.thecotswoldcollection.net/uploads/1/3/1/4/131437753/kumowoloded.pdf
    • http://files.honeybeeman.com/uploads/1/3/2/3/132303075/fajapawosuwab_wareb_wigifajodenez_vorozo.pdf
    • http://files.marinegibert.net/uploads/1/3/1/3/131380953/7630616.pdf
    • http://files.driver4uiceland.com/uploads/1/3/1/0/131070378/715821.pdf
    • http://files.nextpromotionalproductsandapparel.com/uploads/1/3/0/8/130814342/vupuwufijiba-furef.pdf
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.stspain.com/uploads/1/3/0/7/130776575/7eb48.pdf
    • http://files.bohobyjojo.com/uploads/1/3/1/3/131398164/09eab7e1a15.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • https://jabaduxus.files.wordpress.com/2020/06/99519541466.pdf
    • https://pefeledegabo.files.wordpress.com/2020/07/91277822242.pdf
    • https://gepalozevod.files.wordpress.com/2020/06/revokujolugisip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.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_off000055e9.bin
21003216390aa30fe52a878505ab33e3624e611784c0a20416256916cd6d52df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E9 5420 bytes
font_01_sfnt_off00006832.bin
d4c8049d0f229010ce7e802610f6b8802321e9a2ce2c7b32ca54048d1d0f8d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 14856 bytes

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