Malicious PDF — malware analysis report

Static analysis result for SHA-256 25af59f32aa96661…

MALICIOUS

PDF

52.0 KB Created: 2020-08-10 03:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0edd1b55e6541236f49aabe3c6da9a2 SHA-1: 4d03dcaa1ecf1d531bc9b0923fd2a655c48ff5b5 SHA-256: 25af59f32aa96661c9c4ab77c4d682e61f8408f051e2802019c38979df3ebe2a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=protein+synthesis+activity+pdf. The document body contains garbled text but also includes the same malicious URL and several benign Shopify URLs, indicating a potential lure or redirection mechanism. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=protein+synthesis+activity+pdf
    • http://files.irishbarbershop.com/uploads/1/3/2/6/132695714/4658591.pdf
    • http://kuvimun.petalcup.com/uploads/1/3/0/8/130813528/jelodubudow_guxisebovugug.pdf
    • http://files.modelinstitution.com/uploads/1/3/0/8/130873965/jirikodobuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/31142558974.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2063/files/48968081029.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/10061052732.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/74974788433.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/dotug.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/the_bfg_lesson_plans.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/30641227763.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/fibujeru.pdf
    • https://cdn.shopify.com/s/files/1/0438/6933/9808/files/aparato_digestivo_de_las_aves_y_sus_funciones.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/libro_numerologia_y_cabala.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/suwareguzetod.pdf
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/72488344186.pdf
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/93720162538.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c78.bin
50dd2612b9116e182ba627fc2e5ca0d5ff0e73b53af0efa02afdb14f4a602af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 5376 bytes
font_01_sfnt_off00009ecd.bin
85bdc4bbaf0e7396fc4b5f298964eff0e0973e8130c4bebf9e3d734b4ede8cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECD 10748 bytes

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