Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f851254f00a71f…

MALICIOUS

PDF

32.7 KB Created: 2020-08-14 18:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f0367278c7c12dbdb8839c286f81397 SHA-1: 75f37b5a02e7c20e7d1c8979dddbb577265c1c64 SHA-256: a5f851254f00a71f820ba1f45a7fabb15b1d882a2e5d2d6e02aa6312fc670b4f
150 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 of which point to a redirector service at ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=essence+hydrating+face+sheet+mask
    • http://files.odazzitclub.net/uploads/1/3/0/7/130738919/xobebowetogo.pdf
    • http://files.stator-creative.com/uploads/1/3/2/6/132696465/8e2f2f5e.pdf
    • http://files.newellbooks.com/uploads/1/3/0/8/130813797/vapujulo_rajeker_vewidufe.pdf
    • http://files.tcmusicteacherscollective.com/uploads/1/3/1/3/131379860/616618.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/98253305700.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/vozifolezomugu.pdf
    • https://cdn.shopify.com/s/files/1/0454/2785/1422/files/6205846389.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/23845533739.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/wijebesuzoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/xelijiwinezusij.pdf
    • https://cdn.shopify.com/s/files/1/0440/0254/1726/files/juzewaxaxulinave.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/linked_list_class_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/lepepawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/65916610457.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/bilunufif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/77219770614.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_off0000421e.bin
0c98fd2be621c275876717dc7159a9ac292c066882115409c66a88c4742b0cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x421E 5524 bytes
font_01_sfnt_off000054c3.bin
64fe7af26c6b3931662acb4154b37d66125d0b9112f3bfdcb39de8645cc46591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C3 9840 bytes

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