Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b738d878e737763…

MALICIOUS

PDF

47.1 KB Created: 2020-08-02 08:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ad734fac0e579713e1cc870403f539 SHA-1: acd06186dc72871b896b5843cc52a8c7512e0fde SHA-256: 5b738d878e737763f3d1a209256e88ebfbfe251e9bf80eb12ffadc6df22e5586
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text related to uninstalling a package and a URL that points to a malicious redirector. This suggests the document is designed to lead users to malicious sites, potentially for phishing or malware distribution.

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=uninstall+brew+package
    • http://files.warp-drive-physics.com/uploads/1/3/2/7/132712614/606006d9ee1cb8a.pdf
    • http://files.cafe643.com.au/uploads/1/3/1/6/131606211/87936ac.pdf
    • http://files.marcelastrasdas.com/uploads/1/3/2/7/132740260/875de3ac792b7.pdf
    • http://files.thehackney.com/uploads/1/3/2/8/132814155/romokader.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/73539319346.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/vesafelulanisus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1587/2423/files/mobovufatilubuxafubej.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/vilagubujalopul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/64323298462.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/41801244756.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/aventura_los_infiles.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/69942024028.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/zuzerumuloborufavawilis.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/convert_kb_to_gb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/6562511716.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_off0000613f.bin
8e96a8803ed9bb5926ce0f711a739ce9bd871bb8daf847e379c7a8a9f0585cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 5388 bytes
font_01_sfnt_off000073b8.bin
af60d336626e8793fa8b099bac39a4e75a71ee6dd90b68de7147110d8f972248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 11100 bytes
font_02_sfnt_off000099c8.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C8 16312 bytes

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