Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c6a0c675dc955d…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 14:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d05856bd58845b3319c7a6e1075fd0 SHA-1: 47b3101e8f9a01b1a1ac4ac4dcd7791dddece62e SHA-256: 00c6a0c675dc955da1f3c70cdde559cc2200c7cb8755e766c7f16944938cced2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to domains associated with link farms or redirectors, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO poisoning or a phishing lure, directing users to potentially harmful content via the embedded URLs.

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/wb?keyword=urban%20competitiveness%20pdf
    • http://files.savejonesstateforest.com/uploads/1/3/0/8/130814408/guxikogefuz-damido.pdf
    • http://xirewa.straightlinedancefitness.com/uploads/1/3/0/7/130739919/wibuv.pdf
    • http://zaraseguj.jackwatkinscounselling.com/uploads/1/3/2/6/132681352/xiketuzanon.pdf
    • http://files.wellness.org.sg/uploads/1/3/1/4/131437249/7598015.pdf
    • http://files.olgatarasova.com/uploads/1/3/1/6/131606206/lasidexiti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/98961983334.pdf
    • https://cdn.shopify.com/s/files/1/0445/2355/2927/files/aluminum_lithium_alloys.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/57426121224.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/nazimaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/zumika.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/ravojujegosesofasegekoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/technical_graphics_communication_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/8258/6014/files/67241670355.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/fodozusaduwesamevixamemep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/witujafawijukobamefujeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/fesawag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054b4.bin
451ff19fc6306b5937949b33bdfb4d0357b82d7e82e8f62916ba10083b59e5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B4 5248 bytes
font_01_sfnt_off00006668.bin
0020cad333b87ffeb5ce818b129813055f0be4044c69dda03328738fc8296101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6668 9816 bytes
font_02_sfnt_off000087fc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FC 4324 bytes

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