Malicious PDF — malware analysis report

Static analysis result for SHA-256 13101c64d92fe025…

MALICIOUS

PDF

66.1 KB Created: 2020-08-13 14:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c1008ec36c1fa797291f3e9c5fb412 SHA-1: 05470240e412bb6b5cd85d9d7a7b4360692a9fe8 SHA-256: 13101c64d92fe025e70389b38fc4799fe9c077dbc23f2d80b2043f8c9a7b6178
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One prominent link directs to a known malicious redirector, indicating an attempt to lead users to harmful websites. The ML classifier also strongly flagged this PDF as malicious.

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=ultronic%20touch%20screen%20alarm%20clock%20manual
    • http://files.sparkybuddy.com/uploads/1/3/1/3/131398259/5146045.pdf
    • http://tijekup.davidson-eng.net/uploads/1/3/1/4/131482975/dogofafutapelut_pamokagote.pdf
    • http://files.milwaukeecharteradvocates.org/uploads/1/3/1/4/131413718/4926669.pdf
    • http://xosave.rodmanhallalliance.ca/uploads/1/3/0/8/130813834/gerilanol.pdf
    • http://files.stillpointwellbeing.com/uploads/1/3/1/4/131438418/votujinujevuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/jilevageganusugotufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/bopux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/agnes_martin_lugand_livres.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/black_and_decker_iron_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3625/files/antigona_de_sofocles.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/bamotebuzinofejijokete.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/bharathiar_university_bca_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/50880416867.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/mawurimini.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/48089397057.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/bible_book_of_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/44036655007.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/bisosekumuko.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_off0000c2c5.bin
bba213006750a723aa597f685c922e2495424a60d8f395220ede1e5888b1f87e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 5096 bytes
font_01_sfnt_off0000d3e5.bin
27733149b1658fac363f33b7b2075dd92dd9bfeb2b34c8ab8b89dd1a86fd6fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 11772 bytes

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