Malicious PDF — malware analysis report

Static analysis result for SHA-256 804ea19362b49e7a…

MALICIOUS

PDF

52.4 KB Created: 2020-08-05 17:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac476b8e4e361bc12010438b3a16df9f SHA-1: 593ea0ad42875ce372e262a3251703a0716a507f SHA-256: 804ea19362b49e7a4a6a5e382e28fbfff9db7e9f6d54656f4d42b76dcdb71531
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 Shopify domains hosting other PDFs, but one critical link redirects to `https://ttraff.ru/pify?keyword=audience+definition+pdf`, a known malicious redirector. This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=audience+definition+pdf
    • http://files.patriziakingramart.com/uploads/1/3/0/9/130969681/6453677.pdf
    • http://files.amgstudiosla.com/uploads/1/3/1/4/131406930/abc86fb25d1f6.pdf
    • http://files.greatwesternlandscaping.co.uk/uploads/1/3/1/6/131637482/boponix.pdf
    • http://files.brocktonday.org/uploads/1/3/0/7/130738501/24936f.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/xonuleta.pdf
    • https://cdn.shopify.com/s/files/1/0436/5513/5390/files/aadhar_card_change_date_of_birth_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/49386457506.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/putererigavot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/labubudozavelujewe.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/wejum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/xulepipatinuxepimukite.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/mekiwuzikaxedexejajuniso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/hr_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/siwem.pdf
    • https://cdn.shopify.com/s/files/1/0449/6100/5736/files/obtener_certificado_de_secundaria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078aa.bin
245923e5b2b93c8056bba0e6fe841a51244ac6d49de62b58b3eb1b5b297d25c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AA 4624 bytes
font_01_sfnt_off0000887a.bin
1baaa724b60bed72ba9d511f7702cbad9a54be2b81be03484acf5662f7b354b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 8728 bytes
font_02_sfnt_off0000a05a.bin
b30cfea365d79f20762a88fe1a28d2813cd0afb50b693735b94a5be325451671		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA05A 10856 bytes

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