Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cde77e1ff177db…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 17:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9837713d4edb9bd901c2312b5f392ac1 SHA-1: 946c37d9ab7c6c00fb6ff7364f40c8b1d2c91d75 SHA-256: 08cde77e1ff177db2b27918c175036b63db0ff4ce700b42ce8fe5dc089a98e1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to host a link farm, likely to direct users to malicious content or phishing sites. 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.ru/pify?keyword=enzymes+and+chemical+reactions+practice+worksheet+answers
    • http://zodemab.christianmeditationrookies.org/uploads/1/3/1/4/131453133/19610844eb50ac.pdf
    • http://jafuja.rachelbeckles.com/uploads/1/3/1/3/131379015/3716805.pdf
    • http://farozusev.rioranchoco.com/uploads/1/3/2/7/132712323/1558349.pdf
    • http://wekuv.shopcocoavenueboutique.com/uploads/1/3/1/3/131379730/bamixadisozujoxegot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/wawive.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/3282366780.pdf
    • https://cdn.shopify.com/s/files/1/0436/8387/2921/files/xezidemuwetikorapajo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/coordinate_graphing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/coplanar_waveguide_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/pibuvesipedatonilegewex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/18107556205.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/xenujenejuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/96623561157.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/bategadadoziduxupekizis.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_off00006536.bin
c51e6a096394a7ed86b42fc73f889ecfc234d91a4b88cc3a60ea94c92685a736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6536 5576 bytes
font_01_sfnt_off00007817.bin
57b8222c25edf318ceaaf89fce73d74852c521df0f2a88077a25140830b9a7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7817 9908 bytes

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