Malicious PDF — malware analysis report

Static analysis result for SHA-256 894b95a7a51c38e8…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 05:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e840cd77aa8428355a8a58780999d593 SHA-1: 2baac09977487b291209ebf58cb6160c28f2d1fc SHA-256: 894b95a7a51c38e85ae0055c5ed7ba691672850736b1e2a5539514c18e2b2554
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful infrastructure.

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/pify?keyword=pomada+de+barbatim%25C3%25A3o+pdf
    • http://vupuxibul.arielzylberman.com/uploads/1/3/2/3/132303195/1116166.pdf
    • http://files.aafha.org/uploads/1/3/2/7/132710783/1a2509.pdf
    • http://tojome.caring-for-cats.org/uploads/1/3/1/3/131379730/niwabopusap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1313/6799/files/20516070468.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/23559144032.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/84337182367.pdf
    • https://cdn.shopify.com/s/files/1/0440/4684/4054/files/country_risk_analysis_in_international_business.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/zerabulikonutelawusuroxox.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/vimuwubonuwaxiri.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/guwudid.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/analogy_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/76114184327.pdf
    • https://cdn.shopify.com/s/files/1/0439/4926/0968/files/data_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/dusepoxupow.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d5.bin
ceb01b539b81fc6dd239085dff21f7cde4f6b38dbe9d41b4ef268b45e05a5c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 5436 bytes
font_01_sfnt_off000073a4.bin
0adbaac3c8449abd446621757d56814969bae7fce42730237ff15a8b778cdb6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 12656 bytes
font_02_sfnt_off00009ab7.bin
3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB7 16164 bytes

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