Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f72a578d466df6b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-01 01:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8340c00667608a07c0a9c11702d2ffab SHA-1: 146671f89e4bc2c3cb37ad23e4835ca9e836c7c2 SHA-256: 7f72a578d466df6b14a316a501d8d096d37f545e405c0d2eaa771250f869ed64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious websites. The primary redirector URL identified is https://ttraff.com/wb?keyword=paper%20folding%20machine%20user%20manual, which is flagged as malicious. The document's content is disguised as a user manual to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=paper%20folding%20machine%20user%20manual
    • http://files.doodledesignsandrhymes.com/uploads/1/3/0/8/130874612/kofutuguregoxad.pdf
    • http://files.prettybakedqueens.com/uploads/1/3/1/3/131379832/6399225.pdf
    • http://files.survivorsofstrokeniagara.com/uploads/1/3/0/7/130775698/petudu.pdf
    • http://files.bethlehemchristianmission.com/uploads/1/3/1/6/131606175/kufuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/6595533807.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/21211774195.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/kipizuxowegivenobav.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/17330567397.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/dosetegipobolunugawe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4645/1862/files/loduwitobupelixuredawusom.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/66138295751.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/vupesofaluzesageka.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/xetabemegesukuxus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/fibofenatilot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/vozag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/22750695796.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/5606169015.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006916.bin
f113e2b0ed837122841fb98100aa94da5b13b67851be24603cf6d35f2c8513ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 5568 bytes
font_01_sfnt_off00007be3.bin
476fecaca1f4b7f346deb121593b1b0a4d82384f095ce856959daae55f0ca4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 10040 bytes

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