Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ba108de14406e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-15 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ff7738f3d3abcbfb290755aea2bab9 SHA-1: b827968e0a96704abdc8cfec7b0f3898d15ad609 SHA-256: fb9ba108de14406ece27b9909856ac4dcd410f95ee9974498319fbbc6986a11d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm designed to appear as educational worksheets, but it redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary URL, https://ttraff.cc/wb?keyword=number%2011-20%20worksheets%20for%20preschool, is part of a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wb?keyword=number%2011-20%20worksheets%20for%20preschool
    • http://files.dkgca.org/uploads/1/3/0/8/130874205/gufobelesufud.pdf
    • http://files.hlcacademy.ca/uploads/1/3/0/8/130873804/bezobarowe.pdf
    • http://sevufa.themodernmidwife.org/uploads/1/3/0/7/130776647/2693135.pdf
    • http://tozuwotig.halfmoonyogaandart.com/uploads/1/3/1/3/131382406/remeba.pdf
    • http://files.horizonslearningadventures.com/uploads/1/3/1/4/131437750/xodikuwapo-taxofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/21425611237.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/ritmoneuran_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6471/files/xibuxozisonoparej.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/pugixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/22727361750.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/vonedewifip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/parestesia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/amlodipine_besylate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/bewigumuba.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/brief_answers_to_the_big_questions_stephen_hawking_download.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_off0000608b.bin
89a5679e73aa8ddaf10fbabdd6f5c335500ed2bb60559f009a7be0a040eafd23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 5668 bytes
font_01_sfnt_off000073d2.bin
f37e1dad375aa364bf7817f91956e2a03c16fda3c6b7db009acf356b8d9db8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 10284 bytes

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