Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c2b4516b8bbe9e…

MALICIOUS

PDF

40.0 KB Created: 2020-07-15 21:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53858a929606e7bce58f18969a11095 SHA-1: 432d5f18047f75ae69a4bab4351ae3bf23802f1d SHA-256: 06c2b4516b8bbe9e23449df482d71aac3a1c5d6ff0c624d7eead1ec5d719b151
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, masquerading as legitimate worksheets. One of the primary links, 'https://ttraff.com/wb?keyword=word%20ladder%20worksheets%20for%20adults', is flagged as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicates maliciousness.

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=word%20ladder%20worksheets%20for%20adults
    • http://files.mysmileprogram.com/uploads/1/3/0/8/130873758/vapujezolode-mupowirijugokun.pdf
    • http://files.tinforestfarm.com/uploads/1/3/1/6/131607063/salevozezigewod.pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/84833977861.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/48656073037.pdf
    • https://fakemoj.files.wordpress.com/2020/06/70426788511.pdf
    • https://megewusebu.files.wordpress.com/2020/06/nowokak.pdf
    • https://najuwimaz.files.wordpress.com/2020/07/bidopa.pdf
    • https://ditilepikap.files.wordpress.com/2020/06/dozer.pdf
    • https://safanam.files.wordpress.com/2020/07/20338817024.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/86164288727.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/gajebozapufepum.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/20652499137.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/48566787018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/dujataf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/38127915513.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1664/files/miwixewikanogun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/muxomebe.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_off00005f59.bin
6f48f9306d6eb8e1837853f9d2af7243bcb46649717242d3eb49aa0a777a7e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 4892 bytes
font_01_sfnt_off00007030.bin
6152c5c71bb15bcbfa6743169969079e6c26ae81d567e66eac2c32709ce04c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 9996 bytes

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