Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5f1216ad1df820…

MALICIOUS

PDF

40.5 KB Created: 2020-08-10 06:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8e9aec7bf3b773b0baa3035476f7906 SHA-1: 9f95ae1c7552ffb555d5ae97bddeb37b11f677e3 SHA-256: be5f1216ad1df82019013232fc4a0fbb05596e3e8a2b9b29b9a2eed2e6b6fc70
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to `https://ttraff.ru/pify?keyword=beginner+guide+to+investing+pdf`. This URL is part of a link farm designed to manipulate search engine results, ultimately leading users to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs suggest a social engineering lure.

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=beginner+guide+to+investing+pdf
    • http://besisedo.bloomkc.org/uploads/1/3/0/9/130969723/tenuzosefi_biwirixaduva.pdf
    • http://files.northernmichiganlivestock.com/uploads/1/3/0/8/130813904/kisowa.pdf
    • http://files.kristaehughes.com/uploads/1/3/1/4/131454523/36cfa31.pdf
    • http://files.pentecostalcchurch.com/uploads/1/3/0/9/130969708/bewevenip-dufafudobu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/39122812516.pdf
    • https://cdn.shopify.com/s/files/1/0430/4433/9861/files/roxupudesutiwuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/41906010649.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/tomifuzixuliko.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/mugizeregajib.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/tovikuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/vamogusenisetowusabitixin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1062/files/rezovavukakaxetu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/79292190261.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/76928105026.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/jugefexolimelesixubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/52330518340.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_off000061bd.bin
1c6b533b8f98a2de7e48ca0604d21cf6f863f7b21e4f7b3277e7478a282ab3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 5076 bytes
font_01_sfnt_off00007323.bin
d34d374b1450eb3c39c83378066463d0638f2f834380d796ac40f486c8b96f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 10008 bytes

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