Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5ae00270b7e9c4…

MALICIOUS

PDF

47.2 KB Created: 2020-10-15 18:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa395fb1b1a64b5a495bdf9744a8f561 SHA-1: e11e698027a277bb33201f8a4dd0032ed6d4ac14 SHA-256: 6f5ae00270b7e9c41503d1b1f67ecb5bf150dd3781ba14f9b311a8f212a716bb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that are likely part of a link farm designed to drive traffic to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF redirector heuristic confirms the intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://gettraff.ru/123?keyword=shoulder+pain+evaluation+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f87b3cb44b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f875f5f4b7fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f875ca846f49.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/7756668.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kinufijozulof.pdfIn PDF document text
    • https://site-1038561.mozfiles.com/files/1038561/11118608516.pdfIn PDF document text
    • https://site-1039404.mozfiles.com/files/1039404/8155371507.pdfIn PDF document text
    • https://site-1048568.mozfiles.com/files/1048568/96436079370.pdfIn PDF document text
    • https://site-1039529.mozfiles.com/files/1039529/rilin.pdfIn PDF document text
    • https://site-1040209.mozfiles.com/files/1040209/86449942956.pdfIn PDF document text
    • https://site-1038733.mozfiles.com/files/1038733/figukubekowifad.pdfIn PDF document text
    • https://site-1040142.mozfiles.com/files/1040142/nexokiripavisedusini.pdfIn PDF document text
    • https://site-1041922.mozfiles.com/files/1041922/22429376333.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/3b0ba99ac7.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/28ec4.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/676684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 5116 bytes
SHA-256: 64a26b734b4e4dddec1f1e328f1824cd161da48ba5137007afe7d65ddcbc34e0
font_01_sfnt_off00008bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC9 10536 bytes
SHA-256: 12bcf38c8581063aba9e1ca33c1f0dfaa441a5849ff2c670d73140ad2b2fdd62

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