Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eff301750c1d7b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 01:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 043d892d8145c038d55891e60634f9c5 SHA-1: 3a8f05fd30bd5dd6c752633d6f0580e9bbe47f6b SHA-256: 51eff301750c1d7b88ffc367e0ab11bbd68443ac7a3da0220d9d9a1981f2351e
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm designed to manipulate search engine results. One of the primary links, https://ttraff.ru/pify?keyword=cognitive+behavioral+therapy+great+courses+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. 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=cognitive+behavioral+therapy+great+courses+pdf
    • http://files.thecannacontainer.com/uploads/1/3/2/6/132681012/kakotoxubawan_dugaju_bugapo_wozilekobujo.pdf
    • http://files.strongmachinear.com/uploads/1/3/1/3/131380511/butimezupirajupinit.pdf
    • http://files.env.careers/uploads/1/3/0/8/130873921/rajax.pdf
    • http://kuvew.laurafaulconer.com/uploads/1/3/2/7/132710779/gekufubuxal-bujureri-juxanomoxeloger-radoziduri.pdf
    • http://files.ceciliabramhall.com/uploads/1/3/2/3/132303286/237865.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/proyecto_de_grado_electronica_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6184/files/robins_credit_bulletin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/luwamo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5675/files/migek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/mysql_forgot_root_password_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/87424227706.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/24926187439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/52610517460.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/bilisewawejet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/39459581675.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5908/files/tesigumuvibil.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/22347281564.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_off00006a19.bin
a5eadf127eb99329f3c7afc352a106260664a4fe6c0153071bd6bf2dcc794d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A19 5624 bytes
font_01_sfnt_off00007d37.bin
540fe764263fd8af26d771ac4e8f4731abadbf735830624c84f634bf548f9688
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D37 10720 bytes